User defined function
Glossary page
In the world of programming, user-defined functions (UDFs) reign as essential elements. They serve as the main tool for programmers to create applications with reusable code. In this realm, where the majority of code comes from the user or programmer, user-defined functions take center stage in program composition, punctuated occasionally by built-in functions.
https://www.techopedia.com/definition/3888/user-defined-function-udf
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