A function: is a set of commands which can be run by calling it by name.
In Computer programming, a function refers to a group of organized, reusable set of commands (code) that are used to instruct a computer to perform a specific task i.e a single but related action.
Generally, a function receives or accepts data as an input, processes the data and then returns a single result or a set of results as the case may be.
Additionally, the name and arguments contained in a function must always be specified by a function. This makes it possible for a function to be run by a program by calling its name.
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