What is a debounce?

It's basically a variable that prevents an event from going on and on. Here's an example:

Say you want to give a player Money:

debounce = false --true or false, doesn't matter

script.Parent.Touched:connect(function(player) --The brick gets touched and calls the player
    if debounce == false then --Checks to see if it is false
        debounce  = true --Now no one can touch the brick until debounce = false
        --Code to give player Money
        wait(10) debounce = false --Waits 10 seconds before the brick can give money again.
    end
end)

I hope that I've answered your question :D.