what is the use of microdata?

Integrating microdata into your website's code offers a number of potential advantages. First, microdata can give the search-engine spiders more context for the type of information on a website and the way the site should be indexed and ranked. In the example, adding microdata to mark up HTML code on a web page related to the movie "Avatar" would tell search-engine spiders to rank the page in relation to movie sites, not graphic design sites.

Another benefit of microdata is the creation of "rich snippets," which display more information on the search result pages than traditional listings. For example, a Google search using microdata tags for "squash soup recipe" turns up the following results, including images, reviews and cooking timesIf you were searching for a new squash soup recipe, chances are you'd be more inclined to click on one of these than on a traditional listing that displays only the site's title, meta description and URL.



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Essentially, microdata is one of three code languages designed to provide search-engine spider programs with information about website content. To understand how this works in practice, consider the following example provided by microdata listing website Schema.org:

"Usually, HTML tags tell the browser how to display the information included in the tag.
 
Google already changed to semantic search where can see Answers and Related Queries just in search page itself. This already affects no 1 rank holder so more queries in future will also adapt semantic coding which is microdata eventually.
 
Your web pages have an underlying meaning that people understand when they read the web pages. But search engines have a limited understanding of what is being discussed on those pages. By adding additional tags to the HTML of your web pages—tags that say, "Hey search engine, this information describes this specific movie, or place, or person, or video"—you can help search engines and other applications better understand your content and display it in a useful, relevant way. Microdata is a set of tags, introduced with HTML5, that allows you to do this.
 
Search giants Google, Bing and Yahoo announced last summer a rare collaboration to support the use of microdata tagging to generate more relevant and more detailed search results. This offers business owners and other website publishers another opportunity to improve their search engine optimization (SEO) by making a few changes to their websites.
 
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