Which of the following best explains the purpose of a function?

The purpose of a function is to execute a set of instructions. A function is a block of code designed to perform a specific task when called. It allows for code reuse, as developers can define the logic once and invoke it multiple times throughout the program. This promotes modularity and clarity since related instructions are encapsulated within a function, making the overall codebase easier to manage and understand.

While storing data permanently, manipulating control structures, and maintaining program flow are all important concepts in programming, they do not capture the primary essence of a function's role. Functions focus specifically on grouping and executing code to accomplish a particular action or calculation, allowing programmers to structure their code in a logical and efficient manner.