What is UDF?

UDF stands for User-Defined Function. It is a function that is defined by the user of a system (typically a database or programming environment) to extend the system's built-in functionality. UDFs allow users to create custom logic that can be executed within the system, often to perform calculations, data transformations, or other specific tasks that are not natively supported. They are commonly used in databases (e.g., SQL Server, MySQL, PostgreSQL) to encapsulate complex business rules or algorithms and can be written in various programming languages, depending on the system's capabilities.