Too Long; Didn't Read
API stands for Application Programming Interface. API is a type of software interface, offering a service to other pieces of software. API key is used for identification and authorization which is nothing but a security code, used to keep a track of the users. API keys are used to add a protection layer to the API. API functionalities: Establishes a connection between computer systems and enables data accessibility. It also enables monitoring users and their activity. It is a way to hide complexity by eliminating the 'How'