When you're programming, you're literally defining a procedure, or a routine, you want the computer to perform. A simple analogy compares computer programming to baking bread: you list ingredients once to set up the work environment, then you list the steps you must take to end up with a loaf of bread. In both programming and baking, some steps must be repeated at different intervals. In baking bread, for instance, this could be the process of feeding a sourdough culture:
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