I think that you are thinking of a "touchdown," Bingley.
When a team carries the ball (or catches it and retains possession in) the opponent's endzone, the team scores a touchdown, which is worth 6 points.
Other ways to score in football:
Point after touchdown: Upon scoring a touchdown, a team has an opportunity to kick the ball through the upright goalposts. If it does so, it gets another point.
Two-point conversion: Upon scoring a touchdown, a team may, instead of kicking the point after, attempt in a single play to again penetrate the endzone with the ball. If it does so, it gets two more points.
Field goal: a team may, when it has possession of the ball during regular play, attempt to kick the ball through the goalposts. If it does so, it gets three points.
Safety: if a team traps the other team in its own endzone with the ball, the trapping team scores two points.
For more football terms, and more precise definitions, see
http://www.firstbasesports.com/glossaries/ftbglos.htm
