Why API Testing is considered the most suitable form of Automation Testing?

API Testing is considered the most suitable form of Automation Testing because of the following reasons.

• API testing provides the most stable interface and hence allows two programs to communicate with each other.
• It provides faster feedback as API acts as an interface between the user and the application. 
• It successfully validates all the functional paths of the system which are under test.
• In API testing testers can run API tests without any access to the user interface of software applications.
• API Testing is language independent and hence users can select any core language when executing automation tests for the application.