The main feature distinguishing rugby from American football is the method of advancing the ball. In rugby, players can pass the ball only sideways or backwards, while in American football, forward passes are allowed. Additionally, rugby has continuous play without the frequent stoppages seen in American football, focusing on maintaining momentum. Rugby utilizes a unique scoring system with tries, conversions, and penalties, leading to a different style and strategy of play. Both sports demand high levels of physical skill, teamwork, and tactical awareness.