A function is a set of code that performs a specific task. Functions are often written to take arguments, or input values, and return a result. In many programming languages, functions are defined in modules, or libraries, which can be imported into other programs.
Uses of functions
Functions are often used to abstract away complex code, or to perform repetitive tasks. For example, a function could be written to sort a list of numbers, or to calculate the average of a set of values. Functions can also be used to build larger programs by breaking them down into smaller, more manageable pieces. Finally, functions can make code more readable by giving it descriptive names.