Tennis is a sport played between two individuals against each other (singles), or two individuals playing agains another two (Doubles).  Scorring can seem very unusal, with no points called "love", and then points increase in seemingly odd intervals for single "wins" (15, 30, then 40 for a game).  A Set is won with a majority of at least 6 games.  It is played on multiple types of surfaces, which often neccistates the need for different equipment.  Clay, Hard, Grass, and various indoor surfaces will usually bring the need for different tennis shoes.   Hard courts tend to be the fastest games as the ball bounces with most of the force back.  Clay Courts require significant maintenance if you were thinking about setting up one. !