What is a key difference between 'while' and 'for' loops?

The distinction between 'while' and 'for' loops lies in how they manage their execution based on conditions and iteration. The correct choice highlights that a 'while' loop continues to execute as long as a specified condition remains true. This type of loop is particularly useful when the number of iterations is not predetermined. For example, it can be employed to read data until the end of a file is reached or to continue processing user input until a certain command is issued.

In contrast, 'for' loops are often used when the number of iterations is known beforehand, such as iterating over a range of numbers or elements in a collection. They include an initialization step, a termination condition, and an increment/decrement operation within their structure.

Understanding these functional differences helps in choosing the appropriate loop construct based on the needs of the programming task at hand.