Application Programming Interface or API. Tools or routines are used to build software that integrates two applications. Hosted voice and unified communications providers generally provide integrations between their platforms and applications like Salesforce, Sugar CRM, Suite CRM, and more.
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An application programming interface (API) is a computing interface which defines interactions between multiple software intermediaries. It defines the kinds of calls or requests that can be made, how to make them, the data formats that should be used, the conventions to follow, etc. It can also provide extension mechanisms so that users can extend existing functionality in various ways and to varying degrees. An API can be entirely custom, specific to a component, or it can be designed based on an industry-standard to ensure interoperability. Through information hiding, APIs enable modular programming, which allows users to use the interface independently of the implementation.