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Sets and reps are the terms used to describe the number of times you perform an exercise. A rep is the number of times you perform a specific exercise, and a set is the number of cycles of reps that you complete. For example, suppose you complete 15 reps of a bench press.
This is where your sets and reps really come into play. Generally, I like to do 3-5 sets of 3-5 reps on 2 different exercises. This gives your muscles a solid and dense look. This is not, however the most effective way to build size, but this is how to get your pecs to look solid. In order to add some size to your upper pecs, you will need to do more total reps than that.