What is "Debounce" Used for?

Usually when you trigger something such as a Touched event, it will fire rapidly until the player stops touching the button. We usually don't want this. The technique used to prevent this is called debounce.

script.Parent.Touched:connect(function(hit)
    print("Touched!")
end)

The above code will rapidly spam the output with "Touched!" as long as a player's touching the script's parent. What if we only want it to trigger once?

debounce = false
script.Parent.Touched:connect(function(hit)
    if debounce == false then
        debounce = true
        print("Touched!")
    end
end)

The above will only print "Touched!" once, because debounce needs to be false for it to trigger. When it triggers, it sets debounce to true, and makes it impossible for the event to fire a second time.

The variable doesn't have to be named 'debounce' (it can be named whatever you want), but using 'debounce' or something similar makes it easier for others reading your code to figure out what the variable is used for.

You can also add a timer at the end to reset debounce to false, or reset it in a whole other function. The rest is really up to you.