Schema markup is structured data added to a webpage to describe what the page contains in a machine-readable format. It can identify things such as an organization, product, event, article, recipe, person or review.
For website owners, the practical goal is simple: give search engines clearer information about the entities and content on a page.
Schema.org and Google structured data are related, but not identical
Most structured data used by Google Search relies on the vocabulary defined by Schema.org. However, Schema.org contains many types and properties that Google does not use for special search features.
If your goal is a Google rich result, use Google’s documentation for the specific feature as the definitive implementation guide.
Does schema markup improve rankings?
Structured data should not be treated as a shortcut to higher rankings. Its main role is to help search engines understand content and, for supported types, make a page eligible for enhanced search appearances known as rich results.
Eligibility is not a guarantee that Google will show a rich result. The markup must be valid, the page must follow the relevant guidelines, and Google still decides how a result is displayed.
Which format should you use?
Google supports JSON-LD, Microdata and RDFa. For most website owners, JSON-LD is the easiest format to implement and maintain because the structured data does not need to be interwoven with every visible HTML element.
A simple implementation workflow
- Choose the correct type. Start with the real purpose of the page, not with the rich result you would like to obtain.
- Add only accurate information. Structured data should describe content that is actually present and visible on the page.
- Include required properties. Check Google’s documentation for the specific structured data feature.
- Validate the markup. Use Google’s Rich Results Test where applicable.
- Check the live page. After publishing, use Search Console and URL Inspection to confirm that Google can crawl the page and detect the markup.
Schema markup in WordPress
Many WordPress SEO plugins already generate structured data for common page types. Before adding custom schema, inspect what your site is already outputting. Duplicate or contradictory markup can create unnecessary problems.
For more specialized content, custom fields or dedicated schema tools can provide finer control. The important point is consistency: the structured data should match the visible page content and your site’s actual entities.
Keep it accurate, not excessive
Adding every possible property is not the objective. Complete and accurate data is more useful than a large block of markup filled with weak guesses or placeholders. Google explicitly recommends prioritizing correct required and recommended properties over trying to include everything.
Source and further reading
Google Search Central: Introduction to structured data markup