HeartbeatEvent of RunService
RBXScriptSignal Heartbeat (
Description: Fires every frame. The step argument indicates how much time has passed between frames. This is usually around 1/60th of a second. Please note that this will vary depending on the performance of the machine. If the game is only running at 40 FPS, that means that Heartbeat will fire 40 times per second, and the step argument will be roughly 1/40th of a second.
The following code would be put in a Script. The script can be placed in the Workspace.