Torwart
In short
A goalkeeper is a specialised football player whose main job is to stop the ball from entering the goal. They are the only players on the pitch allowed to use their hands within their own penalty area.
In plain words
This player stays near the goalposts to defend against the other team. They wear different coloured clothing so the referee can tell them apart from everyone else. They use their hands, arms, feet, and body to block shots.
A simple example
A striker kicks the ball towards the net, but the goalkeeper dives to the left and catches it before it crosses the line.
Why it matters
A good goalkeeper can win matches by making difficult saves. They also act as the leader of the defence, organising teammates to prevent scoring opportunities.
Easy to mix up
Do not confuse them with a defender, who plays further up the pitch and cannot use their hands.