Both tennis and table tennis have a long history and share some similarities, but naturally the details of them are quite different. Let me explain three different points between tennis and table tennis. The bases for comparison are racket, court and scores.
Of course, both sports use a racket when we play tennis or table tennis. However, the racket for tennis is a little bigger than its counterpart for table tennis.
The sizes of the courts are also distinctive; tennis has a much bigger court than its counterpart. Moreover, we play tennis only outdoors such as on the lawn or clay courts while we play table tennis only indoors, on a ping-pong table.
We should consider the way how to count scores also. As I have told, both tennis and table tennis have differences. Regardless such of keen differences, however, the most important aspect is that both sports has a number of fans and players all over the world.