Schema Markup 2025: Which structured data actually makes the difference

Structured data is one of the few technical SEO levers that simultaneously improves classic Google search and AI systems like Google AI Overviews. Yet less than 30% of websites implement it correctly.

What structured data achieves

Schema.org markup is machine-readable vocabulary in a page's HTML. Google uses it for three purposes:

• Rich Results: Star ratings, FAQ accordions, product prices directly in search results – measurably increase click-through rates
• Knowledge Graph: Data about your business flows into Google's internal knowledge graph
• AI Overviews: Clearly structured data is cited more often in AI-generated summaries

The five most important Schema types in 2025

1. LocalBusiness – mandatory for all physical businesses. Contains name, address, phone, opening hours, GPS coordinates and review aggregate.

2. Product – indispensable for e-commerce. Price, availability, reviews and condition can appear as rich results. Conversion boost through price display directly in search results.

3. FAQPage – quick to implement, big impact. FAQ entries can appear as expandable accordions below the search result – effectively doubling the visible area in SERPs.

4. Article / BlogPosting – for content pages and guides. Provides Google with date, author and category. Important for content that should appear in Google Discover.

5. BreadcrumbList – shows navigation structure in search results. Improves URL presentation and Google's understanding of website hierarchy.

Schema errors Google penalises

Common mistakes: spam markup (ratings on pages without real reviews), hidden markup (schema data not visible on the page), wrong type (LocalBusiness markup on a blog page).

JSON-LD vs. Microdata

Google recommends JSON-LD as the implementation format. It's placed in the head section, doesn't touch visible HTML and is easier to maintain than embedded Microdata.

Schema and AI visibility

Google AI Overviews use structured data to extract and cite facts. Businesses with complete LocalBusiness schema and FAQPage markup appear more often in AI-generated answers to local queries.

Conclusion

Schema markup is no longer optional – it's a prerequisite for rich results, better CTR and AI visibility simultaneously. A technical SEO analysis reveals which Schema types are missing or incorrectly implemented on your website.