Collections involve one thing you mainly focus on collecting while hoarding is keeping every little nic nac you come across. Being a hoarder can become a very serious problem. A serious disease can develope. By watching the show hoarders, I have learned that it is not a healthy habit/hobby as when collecting rocks or some other things that you are into can be fun and entertaining. I dont collect anything myself but I would much rather be a collecter than a hoarder. If I were to collect something it would be nail polish because whatever color you choose to paint your nails expresses your personality. When I paint my nails it makes me happy. I have plenty of colors to choose from so I can have a variety of color to fit my mood for that day or week.