An API call, or API request, is a mechanism for client applications to access services such as applications or servers using structured requests. An API, or Application Programming Interface, is a set of rules and protocols that allow software programs to communicate with each other. APIs enable different applications to talk to each other and exchange information or functionality. An API call is the process of a client application submitting a request to an API and that API retrieving the requested data from the external server or program and delivering it back to the client.
API calls are foundational in many digital processes, from making online purchases to accessing various online services. To make an API call, the client application needs to know the Uniform Resource Identifier (URI) of the server or external program whose data it wants to access. The client application also needs to include an HTTP verb, a header, and an API key or access token. Once the API call is made, the request is assessed and forwarded to an external program, which then passes back data to give the user a response.
API calls are essential for businesses to access another businesss data, piece of code, software, or services in order to extend the functionality of their own products. However, it is crucial to ensure that API calls are properly secured to prevent potential vulnerabilities. An API call is considered safe if it is made with the correct credentials and if its not being used for malicious purposes.
