# User-Defined Functions

- [User-Defined Functions Overview](/docs/server/server-usage/user-defined-functions/user-defined-functions-overview.md): An introduction to User-Defined Functions (UDFs) in MariaDB, explaining how they extend the server's functionality by adding new native-like functions.
- [Creating User-Defined Functions](/docs/server/server-usage/user-defined-functions/creating-user-defined-functions.md): A guide for developers on writing UDFs in C/C++, covering the required interface functions, memory allocation, and thread safety.
- [CREATE FUNCTION UDF](/docs/server/server-usage/user-defined-functions/create-function-udf.md): Install a user-defined function from a shared library. This command loads an external compiled function into the server for extended capabilities.
- [DROP FUNCTION UDF](/docs/server/server-usage/user-defined-functions/drop-function-udf.md): Documentation for the DROP FUNCTION statement, which uninstalls a UDF and removes its entry from the system table.
- [User-Defined Functions Calling Sequences](/docs/server/server-usage/user-defined-functions/user-defined-functions-calling-sequences.md): Technical details on the execution flow of UDFs, explaining the sequence in which initialization, processing, and de-initialization functions are called.
- [User-Defined Functions Security](/docs/server/server-usage/user-defined-functions/user-defined-functions-security.md): Overview of security measures for UDFs, including file location restrictions, required privileges, and system variable configurations.