Web Reference: Jul 12, 2025 · A User-Defined Function (UDF) is a function created by the user to perform specific tasks in a program. Unlike built-in functions provided by a programming language, UDFs allow for customization and code reusability, improving program structure and efficiency. Functions that we define ourselves to do certain specific task are referred as user-defined functions. The way in which we define and call functions in Pythonare already discussed. Functions that readily come with Python are called built-in functions. If we use functions written by others in the form of library, it can be termed as library function... User-defined functions help break down a large program into smaller segments that make the program easy to understand, maintain, and debug. If repeated codes occur in a program, you can use a function to include such codes and execute them when necessary by calling the function.
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