How do you use the select() function and what is its purpose?

I've read from the Wiki that select() is used to return arguments in one of two ways: either the total number of arguments (int) or a tuple of arguments after a given index number. However, I don't get the point of doing this:

select(1, unpack(game.Players:GetPlayers()))

versus doing this:

select("Player1", unpack(game.Players:GetPlayers()))

If somebody can tell me how I can use this function, that would be a pleasure.

select is used for getting either the amount of arguments by provided (if the first argument is "#"), or to get all arguments after the n-th argument.

An example of using select to get amount of arguments:

function amountArguments (...)
	return select("#", ...)
end

local arguments = amountArguments(1,2,3,4, "five");
print(arguments) --> 5

An example of using select to get the arguments after n

print(select(2, "a", "b", "c")) --> "b"	"c"

An example use case is to have a function that sums up all arguments and divides them by the amount of arguments.

function getAverage (...)
	local sum = 0;
	local totalArguments = select("#", ...);

	for x = 1, totalArguments do
		sum = sum + select(x, ...)
	end
	
	return (sum / totalArguments);
end

local ageAverage = getAverage(15, 16, 12, 9, 8, 15, 13, 14, 14, 16, 19)
print(ageAverage) --> 13.727272727273