Quick answer
Schema markup for SEO is structured data, usually written in JSON-LD, that labels the content on your page so search engines and AI tools can understand it. It can earn rich results and clearer entity signals, but it must always match what visitors can actually see.
Key takeaways
- Use JSON-LD, the format Google recommends.
- Mark up only content that is visible on the page.
- Start with Organization, Article, Breadcrumb and FAQ where it fits.
- Validate before and after every release.
Which schema types are worth adding?
| Type | Use it for |
|---|---|
| Organization | Business name, logo, contact details |
| LocalBusiness | Address, hours, service area |
| Article or BlogPosting | Authors, dates, headlines |
| BreadcrumbList | Site hierarchy |
| Product | Price, availability, reviews |
| FAQPage | Visible questions and answers |
Why does schema help with AI search?
Structured data gives machines a clean description of your page, your business and the people behind it. That reduces guesswork and supports entity understanding. Schema markup for SEO does not guarantee rankings or citations, but it removes ambiguity that can hold pages back.
How do you add and test it?
- Choose the schema types that match the page.
- Write JSON-LD and place it in the page head.
- Check it in Google's Rich Results Test.
- Confirm the Schema Markup Validator shows no errors.
- Monitor Search Console enhancement reports.
What mistakes should you avoid?
- Marking up reviews or FAQs that are not on the page.
- Copying schema from another business.
- Leaving out required properties.
- Forgetting to update it when details change.
A realistic starting set
Good schema markup for SEO does not mean marking up everything. For most service businesses, five types are enough to start.
- Organization on the home page.
- BreadcrumbList on inner pages.
- Service or LocalBusiness on service pages.
- BlogPosting on articles.
- FAQPage where real questions appear.
Get these right and accurate before you chase anything fancy. Add the rest only when a page genuinely needs it, and remove anything that no longer matches the content.
Bottom line
Schema helps machines read your pages without guessing. Add the types that fit, keep them true to the page and test them after every change.
Sources and further reading
Checked against the sources above and our own project experience. Last reviewed 7 October 2026.
