What is the function of a library in programming?

The function of a library in programming is to provide a set of precompiled routines for task execution. Libraries are collections of code that developers can reuse in their applications, which simplifies coding by allowing them to call upon predefined functions without needing to write that code from scratch. This can include tasks such as mathematical calculations, file handling, data manipulation, and more. By using libraries, programmers can save time, reduce errors, and create more efficient code as they can leverage existing, tested solutions rather than developing everything themselves.

The other choices do not accurately describe the primary function of a programming library. While securely storing user data, debugging code, and creating user interfaces are important programming activities, these tasks are typically accomplished through other means, tools, or specific frameworks rather than being the core function of a library itself.