What's the difference between reps and sets?

[QueenIsis]

Also, as far as abs are concerned, how many reps/sets should I be doing at one time?

[Spliff Star]

Reps = number of times your lift/push the weight

Sets = number of times you do reps

Example:
I wanna do 3 sets of 10(reps) for bench. I go and bench 10 times, rest, bench 10 times, rest. bench 10 times, finished.

On workout sheets it'll look like "Bench 3x10"