Schema Markup Guide: How Structured Data Helps SEO and GEO
When you see a service page's star rating, an article's author, or a product's price right in the search results, schema markup is usually behind it. In this article we cover what schema markup is, how it helps both classic SEO and GEO, and where to start.
What Is Schema Markup?
Schema markup is structured data added to a page using the Schema.org vocabulary. It restates the information on the page, such as "this is an article, its author is this person" or "this is a product, its price is this much," in a form a machine can read directly. Visitors don't see this code, but search systems read it along with the page.
What It Does for SEO
Google and other search engines display some markup types as rich results. Information like a product's price, star rating, recipe time or event date can take up more space in a search result than an ordinary blue link. This isn't always guaranteed, the search engine decides which markup turns into a rich result. Still, correct markup gives your page a chance to improve how it appears in search results.
What It Does for GEO
When a language model reads a page, it has to work out from the text what the brand is, which service it offers and how that information relates to each other. Schema markup makes that job easier because it also presents the same information in a form a machine can read directly. It raises the chance of the page being understood correctly, though it's not a guarantee. You can also read our deeper look at this in our schema markup and GEO article.
Core Schema Types for a Business
Not every site needs the same thing, but a handful of types repeat across most business sites. Organization or LocalBusiness defines the brand identity, Article or BlogPosting defines content pages, Service defines a service you offer, Product defines a product, FAQPage defines a real question-and-answer section, and BreadcrumbList defines the navigation path. Choosing a type that doesn't match the real nature of the page makes the markup useless.
How to Implement It
The most common method is adding a piece of code in JSON-LD format. This code is embedded in the page's HTML but doesn't change the visible content. Building it into the page template is more sustainable than adding it by hand to every page. If the article template produces Article data itself, the markup arrives automatically whenever new content is added. Every piece of marked-up information must match the text visible on the page, marking up a price or rating that isn't on the page goes against search engine guidelines.
Validation and Maintenance
After setup, check for errors with tools such as Google's Rich Results Test and the Schema.org validator. The markup should be tested again every time the template changes. When the brand name, address or publication date changes, its counterpart in the markup should be updated too.
Conclusion
Schema markup is one of the most concrete steps you can take so your page is understood correctly by both search engines and language models. In our SEO and Google Maps service we plan markup by page type and keep it consistent with the content. Get in touch if you'd like to assess your site's current state together.
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Frequently Asked Questions
Does adding schema markup directly boost rankings?
No. It helps the page be understood correctly and, in some cases, be shown as a rich result, but it doesn't guarantee rankings on its own.
Is JSON-LD required?
It isn't required, but it's usually preferred because it doesn't mix into the HTML and is easier to maintain.
Does a small site need schema markup?
Even a site with few pages can benefit by correctly defining its brand identity and page types. Scaling the scope to the size of the site is enough.
Can incorrect markup do harm?
Marking up information that contradicts the page or doesn't exist there can do harm. A small amount of correct markup beats a large amount of faulty markup.