Schema markup is a vocabulary of tags (developed at Schema.org) that you add to your website's HTML to give search engines additional context about your content. It is one of the most underutilized technical SEO tools, offering significant competitive advantages.
How Schema Works
Search engines read HTML but they often need to guess what content means. Schema markup removes that ambiguity by explicitly labeling data: "This is a product." "This is a review with 4.5 stars." "This is an FAQ." "This organization is located at this address." The clearer the signal, the better the ranking potential.
Rich Results
Implementing schema can enable rich results — visually enhanced search listings that stand out from standard blue links. Types include: Star ratings (Review), FAQ dropdowns (FAQPage), Recipe cards, How-to steps, Event information, Job postings, and Product details.
JSON-LD Format
Google recommends implementing schema using JSON-LD (JavaScript Object Notation for Linked Data) — a script block in the page head or body. JSON-LD is easier to implement and maintain than microdata or RDFa alternatives.
Essential Schema Types
Every website should have: Organization (brand info, logo, social profiles), WebSite (site name, sitelinks search box), BreadcrumbList (navigation path), and page-type schemas. Service businesses should add LocalBusiness. Blogs add Article. E-commerce adds Product and Review.
FAQ Schema for AEO
FAQ schema is especially powerful for Answer Engine Optimization. It displays expandable Q&A pairs directly in search results, significantly increasing click-through rates. Pages with FAQ schema often appear in AI-generated answers from ChatGPT, Perplexity, and Google AI Overviews.
Testing and Validation
Use Google's Rich Results Test (search.google.com/test/rich-results) to validate schema before publishing. Monitor rich result performance in Google Search Console under the "Enhancements" section.