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There are two types of functions: built-in functions, and user-defined functions.The previous topics discuss user-defined functions in detail: they are functions that you write to perform tasks. However, there are entire libraries of built-in CPL functions that perform specific tasks, such as database handling, file handling, math, text manipulation, and more. You will likely find these functions an invaluable tool for your programming needs. However, such a discussion is beyond the scope of this section. Instead, the following topics will assist you in learning more about built-in functions: