Structured data – what it is and why it matters for SEO and AEO

Definition

Structured data is information presented in a predefined, machine-readable format – the basis for schema markup, rich results in Google and a better chance of being cited in AI answers.

Structured data and schema markup – what is the difference?

Structured data is the umbrella concept: information presented in a predefined, machine-readable format rather than as free text. Schema markup is the most common standard for implementing structured data on web pages – a vocabulary defined by schema.org and supported by Google, Bing and other search engines.

In short, structured data is the concept and schema markup is the format used to implement it.

Why structured data matters for SEO and AEO

Search engines and AI models read HTML text, but they interpret it better when the content is explicitly defined with structured data. Without it, the algorithm has to guess what a block of text represents. With it, it gets a direct answer.

Practical effects:

• Rich results in the SERP – star ratings, product prices and events appear directly in the search results and can increase CTR. Google removed the FAQ rich result in 2026 – FAQPage schema is harmless to keep, but it no longer produces a rich result in the SERP. The value lies in the questions and answers in the text.
• Clearer facts for machines – schema states explicitly what is a name, a price or an address. Google says no special markup is needed to appear in AI Overviews and AI Mode, and HowTo rich results disappeared in 2023
• Better crawling and indexing – search engines understand the purpose and content of the page without having to interpret free text
• Competitive advantage – many websites still lack structured data, which makes implementing it a relatively easy way to stand out in the SERP

The most important schema types

• Organization – describes the company: name, logo, contact details and social profiles
• WebPage / WebSite – identifies the page type and helps Google show the right website name in the search results. The sitelinks search box was removed in November 2024
• FAQPage – marks up questions and answers. Valid markup, but it no longer produces a rich result in Google
• Article / BlogPosting – for editorial content; helps Google show the right headline, image and date. No markup is required for Top Stories
• Product – shows price, availability and reviews directly in the search results
• LocalBusiness – central to local SEO, syncs with Google Business Profile

Implementation formats – JSON-LD, Microdata or RDFa?

Structured data can be implemented in three ways:

• JSON-LD – recommended by Google; written as a separate script block in the page head, so it does not touch the HTML structure; the easiest to maintain
• Microdata – attributes added directly to HTML elements; tightly coupled to the markup, which makes maintenance harder
• RDFa – similar to Microdata but more expressive; used mainly in academic and government contexts

JSON-LD is the standard choice for modern Webflow websites and can be added as custom code in the head, for a single page or the whole website.

Structured data and AEO

From an AEO perspective, structured data helps machines connect facts about a brand – name, address, offering. But Google says no special markup is required for the AI features in Search (Google Search Central). What mainly decides whether the right answer is cited is whether the question and the answer are clearly stated in the text itself. FAQPage schema is harmless to keep.

An important principle: structured data reinforces what is already in the text. It does not replace the content, but it makes facts such as name, price and address unambiguous for machines – what is in the text is still what gets cited.

How to validate structured data

Google's own tool for validating your implementation is the Rich Results Test – it shows whether your schema markup is correct and whether it qualifies for rich results in the SERP. Schema.org also offers its own Schema Markup Validator for broader validation.