What does API stand for?

• A. Application Programming Interface
• B. Application Protocol Interface
• C. Advanced Programming Interface
• D. Programming Application Interface

Answer: (A)

API stands for Application Programming Interface, which is a defined set of rules and definitions that lets one software application communicate with another. The three parts map to the idea: an application exposes services, programming refers to the code and functions you can call, and an interface is the boundary you use to interact with those services. This is the standard term you’ll see in documentation and web services. The other options don’t fit because they replace or omit words in the common expansion and describe different concepts (for example, “protocol” implies a communication protocol rather than a callable surface, while the correct phrase uses Application, Programming, and Interface in that order).