Schema markup (also known as structured data) is a vocabulary that assists search engines in better understanding the information on your page. When search engines detect schema markup on your page, they deliver rich results, also known as rich snippets.
Schema markup is code that specifies items on your website in a language that is understood by all major search engines. Search engines can thus provide users with more relevant results.
Schema is a language for representing data; structured data is the actual data. Structured data organises the content of your page and makes it easier for Google to understand.
Google understands 27 types of schema. These are:
1. Article Schema markup
2. Book Schema markup
3. Breadcrumb Schema markup
4. Carousel Schema markup
5. Course Schema markup
6. Dataset Schema markup
7. Employer Aggregate Rating Schema markup
8. Event Schema markup
9. Fact check Schema markup
10. FAQ Schema markup
11. Home Activities Schema markup
12. How-to Schema markup
13. Image license Schema markup
14. Job posting Schema markup
15. Learning video Schema markup
16. Math Solvers Schema markup
17. Movie Schema markup
18. Education Q&A Schema markup
19. Estimated salary Schema markup
20. Podcast Schema markup
21. Practice problems Schema markup
22. Q&A Schema markup
23. Recipe Schema markup
24. Software app (Beta) Schema markup
25. Speakbable Schema markup
26. Subscription and paywalled content Schema markup
27. Video Schema markup
You can add three different code languages to your HTML to notify search engines what is on your page:
1. JSON-LD (Javascript Object Notation for Linked Objects)
2. Microdata
3. RDFa (Resource Descriptive Framework in Attributes)
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