What is the difference between standard sets, supersets and drop sets in conjunction with low reps and high reps?

A standard set is a comprised of a certain number of repetitions of one particular exercise. A superset combines 2 different exercises, usually for different muscle groups, performed concurrently. A drop set technique involves the lowering of a particular weight, after significant muscular fatigue with a heavier weight has been reached, in order to perform repetitions.