Can I See How Many People Are On a Server With a Script?

NumPlayers

The Players service has a property called NumPlayers which is the number of players in the server. That would be the easiest way to get it.

local PlayersInServer = game.Players.NumPlayers

GetPlayers()

The other way would be by using the GetPlayers() method on the Players service. GetPlayers() returns a table with all the players in the server, and because it's a table, we can use the # operator on the table to return the amount of elements in the table, which in our case is the amount of players in the server.

local PlayersInServer = #game.Players:GetPlayers()

Both of these methods will always work fine. Hope this helped!

game.Players.NumPlayers or #game.Players:GetChildren()

NumPlayers or GetPlayers()

EDIT

NumPlayers is an easy way, Example: in the command bar i type "print(game.Players.NumPlayers)" and it prints 0 because im in studio, not play solo or something. GetPlayers() is when you want to get every player and do something with them, Example: Teleporting them all

-- this is an example

 for _, player in pairs(game.Players:GetPlayers()) do
    if player.Character then
        player.Character:MoveTo(Vector3.new(0, 50, 0))
    end
end

if you weed more info go to the wiki pages