SteppedEvent of RunService
RBXScriptSignal Stepped ( double time, double step )Parameters:
Description: Fired on every "step" in the RunService, a time of approximately 1/60th of a second. The time argument is how long the RunService has been running overall. The step argument is the time since the last step.
This code will print Stepped every frame.
game:GetService('RunService').Stepped:connect(function() print("Stepped") end)