What type of loop is recommended for an unknown number of iterations?

A while loop is particularly well-suited for scenarios where the number of iterations is not known in advance. This type of loop continues to execute as long as a given condition remains true. Since the iterations depend on a condition rather than a set number, programmers can use a while loop effectively when they don't have prior knowledge of how many times they will need to repeat a block of code.

In contrast, a for loop is designed for situations where the number of iterations is predetermined or can be explicitly defined, making it less ideal for handling unknown iteration counts. The other options, such as switch case and iterative loop, do not serve the same purpose as a while loop. A switch case is used for control flow based on specific values rather than for repeating actions, while the term "iterative loop" is vague and does not refer to a specific type of loop in programming jargon.