WHILE loops are computational constructs for repeating a set of instructions while some criteria condition is true. During each iteration of the loop, the program: tests whether the condition is true and, if so, executes the block of code within the loop.
When I was a child, we played a great game called 'Spinning around'. This game was loosely based on the computational construct of a WHILE loop. In fact, legend has it that this game was invented by some of the earliest computational thinkers.
The rules for the game were:
WHILE you are not dizzy
Spin around quickly
Throw up or fall down (or both)
I always won. Or, maybe I always lost. Can anyone ever really win that game?