Rhythm is the way time is divided in music.
Rhythm is basically something keeps repeating itself in cycles.
If you have an 8 beat cycle, then it would go from one to eight and then again keep going from one to eight.
Rhythms are the combinations of short and long sounds that move on top of the beat. It is constantly changing. They are what create interest in the music for the listener.
தாளம் - 2 or more beats. Beats placed in uniform intervals. Heart beat, Clock. They are rhythmic. It is the music way of telling time.