a script i found and i have a question i wanna know?

return will return the object created in the function to the assigned variable. For example, say I wanted to create a function that makes a new part and assigns it a random color. Instead of writing it out everywhere I wanted to make the part, I could just have a function return that part. For example:

function makePart()
    local part = Instance.new("Part")
    part.Parent = workpace
    part.Color3 = Color3.new(math.random()) --Gives brick a random color
    return part --Returns the part as the assigned variable
end

local PartWithRandomColor = makePart() --Would fire the function and the variable would assign to what it returns

Getting more complicated:

This is an example of how to use return to get multiple variables. We will get the floor and ceil of a given number (round up and round down)

function Round(number)
    local roundUp = math.ceil(number)
    local roundDown = math.floor(number)
    return number,roundUp,roundDown --Returns the rounded up and the rounded down version of    the number
end

local OriginalNumber,RoundedUp,RoundedDown = Round(math.random()*math.random(1,100)) --Puts a random number through the function
print(OriginalNumber.." was rounded up to "..RoundedUp.." and rounded down to "..RoundedDown.."!") --Prints results

I hope this clears up your question.

I can try to explain it but with a simpler example. The return function returns whatever is inputted, as a result from a function.

Here's an example:

function trueOrFalse()
    if math.random(0,1) == 0 then
        return false
    else
        return true
    end
end

print(trueOrFalse()) -- prints either "true" or "false"

In the example the result of the trueOrFalse function will be either true or false, as the name suggests. Now whenever I put trueOrFalse() in my code it will be a more of a value. With the value being either true or false.