OpenSearch is a collection of simple formats for the sharing of search results. It was created by A9.com, which is an Amazon.com’s company. Many Web browsers supports OpenSearch which includes Google Chrome, Yandex.Browser, Arora, etc., You can also use OpenSearch formats to help people discover and use your search engine and to syndicate search results across the web.
Why use OpenSearch?
The web is a big place, and search engines that crawl the surface of the web are picking up only a small fraction of the great content that is out there. Moreover, some of the richest and most interesting content can not even be crawled and indexed by one search engine or navigated by one relevancy algorithm alone.
Different types of content require different types of search engines. The best search engine for a particular type of content is frequently the search engine written by the people that know the content the best.
OpenSearch helps search engines and search clients communicate by introducing a common set of formats to perform search requests and syndicate search results.
The current version of OpenSearch is 1.1.