What is the primary function of an interpreter in programming?

The primary function of an interpreter in programming is to convert source code into machine code, allowing the computer to execute the program directly. Unlike a compiler, which translates the entire code into machine language at once and creates an executable file, an interpreter translates code line by line or statement by statement at runtime. This allows for immediate execution and is particularly useful for scripting languages and during the development process as it enables real-time testing and debugging of code.

Moreover, interpreters can facilitate a more interactive coding experience, providing instant feedback on errors and helping developers understand how coding constructs work together. This dynamic approach to executing code is beneficial in environments where rapid development and testing are necessary. Thus, the essence of an interpreter lies in its ability to translate code into executable machine language on-the-fly, which is fundamental for the operation of various programming languages.