The Scrum & Lineout
A Scrum is when the forwards on each side bind and the two groups come together, with the front rows interlocking to leave a tunnel between them. The halfback of the non-offending team feeds the ball into the tunnel midway between the front rows.
The lineout is the method of putting the ball back into play after it has gone out of bounds. The two sets of forwards line up opposite each other; a player from one side then calls a play and throws the ball between the two lines.