A function in programming is a self-contained module that can perform a task and optionally return data as a result. It is designed to be reusable and can be invoked from different parts of a program, avoiding the need to write the same code repeatedly. Functions are not just limited to arithmetic operations, they can carry out a variety of tasks. While they may contribute to processing user input or affect the user interface, these are not their primary characteristics, but rather possible applications of functions.
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