Schema markup represents tags or microdata that, when added to the HTML of an individual website page, helps provide a quick reference for search engines and other crawlers that can more quickly be digested. Schema markups can be a powerful form of search engine optimization due to the increased efficiency and contextual references that are gleaned from them. Additionally, the code helps search engines return more informative results for users compared to traditional HTML tags. Website developers can put schema markup codes on websites to direct the search engine to display certain content during searches. For more information, visit Schema.org.