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In short, Lists are used to store multiple items in a single variable, they are convenient data structures for representing a sequence of data. In that regard, a list is similar to a string, except a string can hold only characters, however, a list can hold any Python object.

Python Functions: (user-defined or from libraries) function is a block of code which only runs when it is called, to do a complete job (module), is named, and can be called to execute multiple times at many places in the program. What happens if you don’t use function? What I can think about is repetitive works, hard to debug, hard to expand the whole code, so usually when working on a large project you need to split your code into many small modules.