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An application programming interface (API) is the code that allows two programs to communicate with each other. APIs define the right way for a developer to request services from an operating system (OS) or other applications and share data across contexts and across multiple channels. In the early days of Web 2.0, the concept of integrating data and applications from multiple sources was called blending. Any data can be shared with the application interface. APIs are implemented by calling functions that consist of verbs and nouns; the required syntax is described in the documentation of the called application. For example, on a real estate website, one API might publish available properties by geographic location, a second API provides visitors with current interest rates, and a third API offers a mortgage calculator. The web, software for sharing information over the Internet, and cloud computing have combined to increase interest in APIs in general and services in particular. The API consists of two related elements. The first is a specification that describes the method of information exchange between programs to process and return the required data in the form of a request. The second is a software interface written according to this specification and published in some form for use. Software that wants to access API functions and capabilities is said to call them, and software that creates an API is said to publish them. APIs authorize and grant access to data requested by users and other applications. Access to a service or feature item is authenticated using predefined roles that define who or which service can access certain operations or data. The API also provides an audit trail detailing access to the system: who, what and when. Applications that call APIs have traditionally been written in specific programming languages. Web APIs can be called by any programming language, but can also be accessed using HTML-embedded web pages or application generation tools. The most popular API architectures are Representational State Transfer (REST) and Simple Object Access Protocol (SOAP), which define a standard XML-based communication protocol specification for exchanging messages. SOAP requires less low-level infrastructure code than REST, but the REST API is easier to scale and redeploy, easier to deploy, and easier to integrate into websites and services. The current trend in the industry is to primarily use REST APIs, especially for online interactions. API continuously improves the quality and delivery of software and services. Purpose-built software today is often written with reference to APIs that provide commonly used functionality. This reduces development time and cost and reduces the risk of errors. The growing number of web services provided by cloud service providers via APIs has also fueled the development of cloud computing applications.An application programming interface (API) is the code that allows two software programs to communicate with each other. APIs define the right way for a developer to request services from an operating system (OS) or other applications and provide data in different contexts and across multiple channels. In the early days of Web 2.0, the concept of integrating data and applications from different sources was called a mashup. Any data can be shared with the application interface. APIs are implemented by calling functions that consist of verbs and nouns; the required syntax is described in the documentation of the called application. For example, on a real estate website, one API might publish available properties by geographic location, while a second API offers the visitor current interest rates, and a third API offers a mortgage calculator. The web, software for information exchange over the Internet, and cloud computing have all come together to increase interest in APIs in general and services in particular. The API consists of two related elements. The first is a specification that describes how information is exchanged between programs, how to process it in the form of a request and return the necessary data. The second is a software interface written to that specification and published for use in some form. Software that wants to access API functions and capabilities should call them, and software that creates an API should publish them. APIs authorize and grant access to data requested by users and other applications. Access to a service or functionality is authenticated using predefined roles that define who or which service can access specific actions or data. The API also provides an audit trail detailing access to the system: who or what and when. Applications that call APIs have traditionally been written in specific programming languages. Web APIs can be called from any programming language, but they can also be accessed from web pages created in HTML or application generation tools. The most common API architectures are Representational State Transfer (REST) and Simple Object Access Protocol (SOAP), which define a standard XML-based communication protocol specification for exchanging messages. SOAP requires less infrastructure-related low-level code than REST, but the REST API is easier to scale and redeploy, easier to implement, and easier to integrate into web pages and services. The current industry trend is the widespread use of REST APIs, especially for web interactions. API continuously improves the quality and delivery of software and services. Software that is specifically designed for a specific purpose is now often written with reference to APIs that provide commonly useful functionality. This reduces development time and cost and reduces the risk of errors. The growing number of web services that cloud providers provide via APIs has also fueled the creation of cloud-specific applications
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