First of all, a beat is the sound of the tempo basically, for instance kick, snare. kick, snare. etc. (not all songs are sequenced that way, but hey.)
It shouldn't give it that staccato sound if the tempo is set high enough for the chops all to just blend nicely.
A loop I'm guessing, would be a certain part of a song that's not chopped up sounding but just looped, it keeps the same certain melody/groove as you heard on the record repeating. And if you don't chop up the loop to play smoothly for a quantized (look up the definition if you don't know) playback, your drums wont sit properly on the loop. Some samples drums/beat (not all samples have drums but do have a beat/tempo) have alot of swing, others are just really off for whatever reason. So when you chop the loop by the beat, then play your chops back as a loop, it sounds nice and on tempo and your able to put your drums on a lot easier. You can even add swing and shit properly that way. I don't know how to get more in depth about it unless I was able to show you in person, if you don't get this your best bet would be to watch vids on youtube explaining it visually