What is a restricted area in hockey?

In hockey, a restricted area refers to specific zones on the ice where certain rules apply, particularly regarding goaltender play. For instance, the trapezoidal area behind the net, known as the "goalie trapezoid," restricts where goalies can handle the puck. If a goalie plays the puck outside this area, they may be penalized for delay of game. Additionally, the restricted area concept helps maintain player safety and game flow.