How many players are in a line out in rugby?

A line-out is the means by which, in Rugby union, the ball is put back into play after it has gone into touch. It is the equivalent of the throw-in in association football.

the forwards normally seven of them from each side line up along side each other at the point the ball went in to touch. The first player from each line must stand on a line that runs parallel to the touch line and is 5 meters in infield. The thrower, normally the hooker (no 2) will then throw the ball in the middle of the 2 lines of players. The players then must jump to take the ball and therefore gain advantage