I dont understand what parameters are, can someone explain what parameters are?

Roblox defines parameters as, "Parameters are definitions of what a function expects to receive when it’s called." I don't understand this, what does that mean?

local function Combine(V1,V2)
	local V3 = V1 + V2
	print(V3)
end

Combine(3,2)

Ehm i think parameters is for example Parameter is Combine(3, 2)

Parameters are, well, what roblox said. But here's an example.

game.Workspace.Part.Touched:Connect(function(thethingthattouched)
	print(thethingthattouched)
end)

So, the parameter here is "thethingthattouched". You can name it whatever you want, but it will mean what caused the function. So, in this script here, whatever touches the part will be thethingthattouched. I hope this makes sense.