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In this video tutorial, I will teach you how to create and call functions. A function is a small self-contained program (a block of code) that can be called to perform a task. A function is one of the techniques for achieving code re-usability. At the end of this tutorial, you should be able to make your programs concise and reduce the likelihood of introducing bugs into your programs as a result of repetition of statements. I also discuss the concept of recursion and how to create a recursive function.