Definitions, checked against what buyers do

The terms are easy to look up. What is hard to find is whether anyone is buying — so each of these defines the thing, then reports what verified buyers in that market say they are actually doing about it.

What it is

A plain definition first, then the adoption picture the category's own marketing tends to leave out.

AI Search

What is answer engine optimization (AEO)?

Buyers can’t agree on the acronym — but they are spending. Four routes to AEO budget, and why buying a tool is the last one.

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AI Search

What is agentic commerce?

The most-named priority in ecommerce with the fewest tools behind it. What brands are actually piloting — and what it comes out of.

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MarTech

What are AI productivity tools?

The standard follows the office suite, teams pick on quality — so two in five companies run more than one assistant, governed closely and measured loosely.

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Measurement

What is marketing attribution — and which of your tools is already doing it?

The definition is settled. Which of your tools is answering it is not — and for most buyers it is the analytics platform they already owned.

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Measurement

What is incrementality testing?

It is winning the argument about which number to believe — and not winning the budget line away from anything.

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Measurement

What is marketing mix modeling — and why is there no default tool for it?

The category with the lowest tool ownership of any measurement approach here. Most teams doing it are not buying software to do it.

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Analytics

What is competitive intelligence software?

Never one tool: a separate competitor-data feed for each channel, trusted directionally, sometimes checked against a second source — and unused as often as it is overpriced.

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Analytics

What is session replay software?

Bought to find friction and bugs, free at smaller companies and enterprise-grade at larger ones — and let down most often by recordings nobody has time to watch.

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MarTech

What is marketing automation?

Actions triggered by behaviour, not a calendar. Its products overlap almost entirely with email platforms — its buyers barely overlap at all.

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Product Discovery

Site search vs product recommendations

Search answers a typed query; recommendations fill a slot. Most tools skew hard toward one job — and the same teams shop for both.

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Reviews

What is review syndication?

A retail-distribution feature, not a reviews feature — and it comes up with about four in ten PowerReviews buyers against one in eight Yotpo buyers.

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Commerce

What is ecommerce site search?

Every store starts on the platform’s built-in search, so the real question is when it stops being enough — and the trigger is usually merchandising, not bad results.

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Personalization

What is a personalization engine?

It decides what a given visitor sees — but almost never as a product of its own. Most personalization arrives inside a tool bought for something else.

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Experimentation

What is A/B testing?

Two versions, random split, one metric. The constraint is arithmetic — and buyers say “A/B testing” roughly five times as often as “experimentation”.

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SMS

What is SMS marketing?

Permission-based messaging on different rules from email. SMS and email are the largest co-shopped pair here — and a dedicated SMS tool is rarely the only one in the stack.

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Push

What is push notification software?

Mostly sent from the same platform as email and SMS, strongest where the app is the product — and one notification too many from being switched off.

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Social

What is influencer marketing software?

Two products under one name — commission and creator-storefront tools, and relationship platforms — and commission tools now appear in more of the stacks we see as influencer and affiliate merge.

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Social

What is social media management software?

Publishing, listening and customer care — sometimes split across vendors, and often run by someone other than the leader who buys it.

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Affiliate

What is affiliate marketing software?

Two programs under one word — publishers and creators — and buyers choose by where their partners are and how much help they need, more than network versus platform.

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ESP

What is an ESP (email service provider)?

The platform that holds your list and sends the messages — and the one category where almost every buyer already owns one.

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ESP

What is customer journey orchestration?

Buyers expect it from their messaging platform, never their CDP — and the thing standing in the way is whether the data is ready, not the tool.

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Identity

What is identity resolution — and which kind do you need?

Two products, one name. One de-anonymizes your site traffic, the other matches your file to outside platforms — and company size predicts which you mean.

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Identity

What is a data clean room?

Narrow, not emerging. Two triggers, an all-enterprise cohort — and it does nothing without a partner on the other side.

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Customer Feedback

What is voice-of-customer software?

Two distinct purchases, not interchangeable: enterprise feedback programs bought by customer-experience teams at large companies, and lightweight post-purchase surveys small brands use mostly for attribution.

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Loyalty

What is a loyalty platform?

Enrolment, earn-and-burn, tiers and the member record. It also has the lowest ownership concentration of the categories compared here — no dedicated vendor reaches one buyer in twenty-five.

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Loyalty

What is referral marketing software?

Among the lowest-rated products buyers describe: results disappoint more often than they succeed, few are quantified — and the tool is not always the problem.

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Customer Data

What is data enrichment?

One label, two products: B2B contact data and consumer data. Among buyers shopping for it, not one runs a tool from both halves.

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Customer Data

What is zero-party data?

A useful distinction and a poor shopping list — buyers collect it constantly and almost never call it that.

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Customer Data

What is customer segmentation software?

Mostly built in the email platform, the harder ones by analysts — and often stale by the time it reaches the channel, with results rarely measured.

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ESP

Does your ESP replace a CDP?

For a number of buyers it already has — and the ones it works for can name the exact point where it stops.

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CDP

What is a CDP — and do you actually need one?

Some buyers in market aren’t choosing between CDPs at all. They’re deciding whether they need a separate product.

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Product Data

PIM vs DAM: what’s the difference?

The definitions separate cleanly and the products don’t. The sharper difference is in who shops for each — and only one of the two is bought by an unusual crowd.

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Product Data

What is product content syndication?

The PIM job, not the feed job: syndication comes up with about seven in ten Syndigo buyers and almost none of Feedonomics’ or Productsup’s.

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Commerce

What is headless commerce?

Buyers run it on Shopify far more than on a composable stack — and the cost lands where the architecture diagram doesn’t show it.

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Commerce

What is an order management system?

A job before it is a product: most companies run it in their platform, ERP or own code, and the case for a dedicated OMS grows when orders come from and go to several places and existing systems cannot keep up.

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Commerce

What is an ERP (enterprise resource planning)?

Rarely owned by ecommerce, yet it constrains what the storefront can do — and its migrations hold up other projects for years.

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Commerce

What is ecommerce fraud prevention software?

Three purchases under one label — and for order fraud, a dedicated vendor offering decisioning and sometimes a chargeback guarantee, or the screening built into your processor. Buyers judge both on the good orders they let through.

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Commerce

What is marketplace management software?

Two purchases that share vendors: brands selling on Amazon, Walmart and retailer marketplaces, and large retailers running their own — where some marketplaces dictate the connector.

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Customer Data

CDP vs DMP: what’s the difference?

Buyers describe the DMP in the past tense — a one-way migration, and they can name the technical reason it broke.

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Customer Data

CDP vs CRM: what’s the difference?

Buyers almost never choose between them. They run both, in sequence — and routinely let one product wear both labels.

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Retail Media

What is retail media?

One name, two opposite investments. Brands find the fragmentation expensive to buy across — and it is the same fragmentation that makes retailers’ inventory hard to sell.

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Whether you need it

Same evidence, asked the other way round — for terms where the real question is not what it means but whether it earns a line in the plan.

Common questions

What are these pages?

Definitions of terms buyers are hearing, each followed by what buyers in that market say they are actually doing about it. The definition is the easy half and it is available anywhere. The second half is the part that is hard to get: whether the thing has budget behind it, who is buying, and what they are buying it instead of.

Are these definitions, or research?

Both, and the order matters. Each page opens with a plain definition so the term is settled, then spends the rest of its length on evidence from verified buyer interviews. A page that only defined the term would be repeating what a vendor’s own website says. The reason to read one of these is the gap between how a category describes itself and what buyers report doing.

Why do some of these say buyers rarely use the term?

Because that is what the interviews show, and it is worth knowing before you build a plan around a phrase. Some of these terms describe something buyers do constantly under a different name. Others name a genuine product category with a narrow set of buyers. Telling those apart is most of the value, so we report it either way rather than treating every emerging term as an emerging market.

Who are these written for?

Buyers — the people deciding whether a term deserves a line in next year’s plan. There is no vendor section on these pages and no vendor can edit one. Vendors are welcome to read over the buyer’s shoulder, and several of these pages are less flattering to a category than its own marketing would be.

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Methodology. Alium conducts verified interviews with software buyers — the people who select and operate these platforms. Each explainer defines the term, then reports what buyers in that market say they are doing about it, including when the honest answer is that very few are doing anything. Buyer identities are verified at interview time and anonymized before publication; vendor names are reported as given. No vendor paid to appear or was able to edit these pages.