Why loops matter A loop is a control flow structure that executes a block of code repeatedly as long as a condition holds. They matter for three reasons: they reduce redundancy (no manually retyping the same statement), they save time and space (keeping code short and maintainable), and they handle dynamic data (processing a list or user input of any size without rewriting the code for each possible length). for loops Use a for loop when you know exactly what you're i...