Simple question help me ?!

Reps means Repetition.
Sets means a group of many repetition.

For example:
I will do 3 sets of 10 reps for sit ups.
In total I am going to do 30 sit ups, but I will break it into 3 parts.

This means. I will complete 10 repetitions of sit ups, 3 times. People like to separate the exercise into sets so it gives them time to rest in between. Also it organizes the workout so that you stay consistent. I hope this helps.

Rep is short for Repetition. If someone does 10 reps, that's 10 repetitions.
And it would be a set of 10 repetitions.

Hence, 3 Sets of 10 Reps would be 3 groups of 10 repetitions of a particular exercise.

Ok reps are like ten push ups sets are like 10 push ups x 3 for a total of 30 pushups in 3 sets