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A "for loop" is a type of loop that iterates a specific number of times. This is achieved by initializing a counter variable, specifying the end condition (when the loop should stop), and updating the counter at each iteration. The general structure of a "for loop" in most programming languages is: ``` for (initialization; condition; update) { // code to be executed } ``` For example, if you want to iterate 5 times, a "for loop" in Python would look like: ```python for i in range(5): print(i) ``` In this example, the loop iterates from 0 to 4, executing the print statement 5 times. The range function in Python creates a range of numbers from the start (0 by default) to the specified end-1 (so, 5-1 = 4 in this case), taking the default step 1 for each iteration. The number of iterations is thus known and set at the beginning.

A "while loop" is another type of looping structure that iterates as long as a specified condition is met (i.e., evaluates to "True"). The general structure of a "while loop" in most programming languages is: ``` while (condition) { // code to be executed } ``` For example, in Python, a "while loop" that iterates 5 times would look like: ```python i = 0 while i < 5: print(i) i += 1 ``` In this example, the loop starts with "i" set to 0 and continues iterating as long as "i" is less than 5. After each iteration, the value of "i" is incremented by 1 using the "i += 1" statement. This loop also executes the print statement 5 times but does not explicitly state the number of iterations at the beginning.

When the number of required iterations is known beforehand, it is more suited to use a "for loop". This is because "for loops" inherently have a built-in counter variable, exit condition, and update mechanism that make them convenient for situations when the number of iterations is predetermined. On the other hand, "while loops" require the programmer to manage these aspects manually and are better suited for situations where the loop has to run as long as specific conditions are met or for scenarios where the number of iterations cannot be known in advance.