Key based API = Highly secure API
API key is a unique identifier used to authenticate a user, developer, or calling program.
APIs are important from a technical standpoint because they allow one computer program’s abilities used by another.
APIs are used to send and receive data in software applications. It can also use APIs to connect two programs and share functionality.
An API key is required to connect to or communicate with another API. API keys are the first step in securing cloud APIs.