The full name of API is application programming interface, which is application programming interface. Programmers can write applications and widgets to interact with the page server. API provides a web-based data and function access interface. For example, using the GoogleMaps API, you can export data and map information from Google. Moreover, using APIs no longer requires much professional programming. Many APIs are accompanied by example demonstration documents to tell users how to use them. 1. YouTube API The operation is simple, and you can export video lists, rankings, tags, urls... from YouTube. 2. Flickr API The Flickr API provides two ways to access URLs. It can be realized: create new set, edit comments, export data... 3. Google Maps No need to say more about this 4. Delicious API Delicious API is not as complex and powerful as other APIs, but it is simple, and you can see the results by entering the URL in the browser, and you can also add bookmarks, rename tags, etc. 5. Digg API Use the Digg API to access personal stories, comments, or public data. 6. Google Ajax Feed API You can download JavaScript-based Atom or RSS feeds to easily aggregate your content, very quickly. 7. Windows Live API Provides numerous APIs for different Microsoft services. 8. Yahoo Search API Even more popular than Google Search API. You can create a simple spell checker or site search widget. 9. Google Search API Google Search API is an AJAX Search API. Google Search can be added to the page by using JavaScript, and Google provides a lot of example codes. 10. Feedburner API Feedburner is an RSS feed creation tool. Its API brings many interesting experiences to developers, especially the Feedflare API, It can add new features to Feedburner feeds. 11. Facebook API Facebook is a very famous and successful social networking site with many examples, application creation wizards, and libraries that users can use themselves. Since Facebook generates entirely user-generated content, the Facebook API is a prime resource. 12. eBay API Ebay's API is comprehensive and supports almost all mainstream web scripts, including flash and Ajax. 13. Audio Scrobbler API Last FM uses the Audio Scrobbler API to obtain information about the music you listen to. It is also a plug-in for many "what to listen to now" applications. 14.Upcoming The Upcoming API can be used to obtain data from Yahoo's website upcoming.org. It is very useful in getting instant event information. 15. MediaWiki API Wikipedia offers over 2 million resources, and the Mediawiki API allows access to much of this content. Sites based on the Mediawiki API include: Wikitravel, Wiktionary, and WikiNews.