Volleyball is a team sport played by two teams over a net. The objective is to ground the ball on the opponent's side or cause the opponent to commit a fault. The game was invented in 1895 and can be played indoors or outdoors. Key rules include serving behind the baseline, scoring on opponent errors, and rotating positions after winning the serve. Basic skills include overhead serve, forearm pass, spike, block, and overhead pass. Proper form and technique are important for executing these skills effectively.