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Message: <blockquote data-quote="KingCM" data-source="post: 18002846" data-attributes="member: 482722">What is an API?          An application programming interface (API) is a particular set of rules ('code') and specifications that software programs can follow to communicate with each other.  It serves as an interface between different software programs and  facilitates their interaction, similar to the way the user interface  facilitates interaction between humans and computers.      How is it used?   The same way any set of rules are used.   When and where is it used?   Depends upon realm and API, naturally. Consider these:  <ol style="text-align: left"> <li data-xf-list-type="ol"><a href="http://en.wikipedia.org/wiki/IA-32" target="_blank">The x86 (IA-32) Instruction Set</a> (very useful <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";-)" title="Wink    ;-)" loading="lazy" data-shortname=";-)" /></li> <li data-xf-list-type="ol">A <a href="http://en.wikipedia.org/wiki/BIOS_interrupt_call" target="_blank">BIOS interrupt call</a></li> <li data-xf-list-type="ol"><a href="http://en.wikipedia.org/wiki/OpenGL" target="_blank">OpenGL</a> which is often exposed as a C library</li> <li data-xf-list-type="ol">Core Windows system calls: <a href="http://en.wikipedia.org/wiki/Windows_API" target="_blank">WinAPI</a></li> <li data-xf-list-type="ol">The Classes and Methods in <a href="http://www.ruby-doc.org/core/" target="_blank">Ruby's core library</a></li> <li data-xf-list-type="ol">The <a href="http://www.w3.org/DOM/" target="_blank">Document Object Model</a> exposed by browsers to JavaScript</li> <li data-xf-list-type="ol"><a href="http://en.wikipedia.org/wiki/Web_service" target="_blank">Web services</a>, such as those provided by <a href="http://developers.facebook.com/docs/" target="_blank">Facebook's Graph API</a></li> <li data-xf-list-type="ol">An implementation of a protocol such as <a href="http://en.wikipedia.org/wiki/Java_Native_Interface" target="_blank">JNI in Java</a></li> </ol></blockquote>

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