Let me break that down piece by piece.
— print is the function. It's a built-in command in Lua, the language Roblox uses.
— The parentheses — the round brackets — are where you put what you want to display.
— And the quotation marks around the text tell Lua that this is a string — which just means a piece of text.
So when this script runs, it's going to take whatever is inside those quotes, and send it to the Output window."