In computer science, an interpreter is a computer program that performs commands written in a computer programming language. Interpreters are one of the two most important ways a program can be run, the other being compilation.

The interpreter is a language processor which converts a high-level programming language like JavaScript into machine language by converting and executing it line-by-line. If there is any error in any line, it reports it at the same time and program execution cannot resume until the error is rectified.

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