Tennis is a game played between either two players ("singles") or two teams of two players ("doubles"). Players use a stringed racquet to strike a hollow rubber ball covered with felt over a net into the opponent's court. To correctly play the game the ball must fall in certain areas of the opponents court. The goal of the game is to not allow the opponent to throw the ball back into the correct area.

Sourced

• I honestly don't understand it, because it's somebody hitting a ball to where you can't get it, but you want to get it. I think they should rethink it.
  • Kathy Griffin, My Life on the D List, Season 2, Episode 4 (2006-06-27)

• I have these two sayings, “Champions adjust” and “Pressure is a priviledge”. Tennis teaches you about those things. When you're playing a tennis match, you can't say, “Stop, I want to do another take”, or “Can I play that over?” That's the way sports are.
  • Billy Jean King, Daily Express, 29th October 2008.

"To see Good Tennis! What divine joy
Can fill our leisure, or our minds employ?
Let other people play at other things;
The King of Games is still the Game of Kings"

-from Parker's Piece by J.K. Stephen