A While Loop is a structure you use to execute a block of LabVIEW code repeatedly until a given condition is met. When the VI runs, the code inside the While Loop executes, and then the terminal condition is evaluated. The While Loop will be a familiar concept for experienced programmers as it operates similarly in other computer languages.
LabVIEW While Loop flowchart
Unlike a For Loop, While Loop execution does not depend on iteration count; thus, a While Loop executes indefinitely if the condition never occurs.
For more information on what a While Loop is, including its components and configuration options, look into While Loops in LabVIEW Help.