What Does this mean?

for _,v in pairs(game.Players:GetPlayers())

I don't understand what the _ is used for in the code ive never used in pairs in my life can someone explain?

So what this is what it does .. for is used to iterate _,v they can both be any value you like t,u . _ is the position of the argument in the table and v is the value it self. (game.Players:GetPlayers()) Will make a temp table with all the player names inserted. Hope this helped.