A tennis ball is a example of-
a sports ball or a type of ball that is used in the sport of tennis.
A tennis ball is an example of a sports ball or a ball used in the game of tennis.
A tennis ball is an example of a sports ball used in the game of tennis. It is a small, lightweight ball typically made of rubber and covered in a felt-like fabric. A tennis ball is specifically designed to have a high bounce and is used during tennis matches for players to hit back and forth over a net.
To find this information, you can do a simple search on the internet using a search engine like Google. Type in "What is a tennis ball?" or "Definition of a tennis ball" and you'll find multiple reliable sources such as educational websites or sports equipment manufacturers that explain what a tennis ball is.