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Application programming interface (API) is a software intermediary between two applications that interact with each other. It connects two computers or computer programs through an interface.

Don't confuse this interface with the user interface, which connects a person to a computer or computer program. The API connects pieces of software and computers together and is not intended for direct use by the end user, except by a programmer who wants to integrate it into a software solution.

APIs simplify programming and can actually hide the internal details of a system, such as how it works, and expose useful parts to a programmer, keeping the parts consistent despite internal changes. Nowadays you can find a wide variety of APIs for various purposes, such as operating systems, software libraries, programming languages , computer greece whatsapp number data hardware, etc.

Additionally, building an API requires you to follow a standard or document called an API specification that tells you how to use or build an API.

APIs consist of many different parts that act as a collection of services or tools for the programmer to use. The programmer or program that uses these parts must first make a "call" or request. These calls are called requests, methods, endpoints, or subroutines. You can make four types of requests with the API: GET, PUT, DELETE, and POST.

Components of an API
APIs include technical specifications that explain the exchange of data between services through data processing and delivery requests. They also have a software interface that allows applications to exchange information. APIs also have:

Protocols: These are a set of rules to define how applications interact with each other, such as HTTP , SOAP, XML-RPC, REST, etc.
Format: This is the style of data exchange between applications. It defines how the API will retrieve data and deliver it to consumers. The API can make requests over a protocol and retrieve information in a given format, such as XML or JSON response.
Procedures: These are specific tasks or functions that an application performs.
Tools: These are used to build APIs. You can find many tools available to build, test, and manage your APIs, such as AWS, IBM Cloud, SoapUI, JMeter, etc.