In this instance, one attacking player passes the ball across the goal in the air, and the other player (either standing in place or in motion) strikes the ball with his foot before it hits the ground. This is advantageous over a normal strike in that the player does not need to trap the ball, taking an extra touch and allowing the goalkeeper a few extra seconds to react.
In this situation, an attacking player passes the ball in the air, and another player (either standing still or moving) kicks it before it hits the ground. This is advantageous because the player doesn't need to control the ball first, giving the goalkeeper more time to react.