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</source>A '''WHILE''' loop can be used to create a '''Determinant Loop'''. That expression term means that the number of loops (also referred to as: 'repetitions' or 'iterations') are already known or 'determined'in advance. Below is a determinant WHILE loop that will count to 5. Each time the loop is run, it will add one to the count variable, increasing the variables number.<br><br>

</source>A WHILE loop can also be used as an '''Indeterminant Loop'''. That term means that the number of loops are '''unknown''' in advance. For example, the loop keeps on repeating until the user enters the correct data - we have no idea how many times that user will do that, since that is the job of the user running the script and NOT the programmer. Indeterminant Loops are extremely useful for '''error-checking''' in order to prevent incorrect data being accepted and causing the script not to perform correctly.<br><br>