Easier - A collection is a group of things gathered or collected. A person is a collector when they brings items together into a group.
People collect different things.
Harder - Collecting is a great hobby because it can be different, unique for everyone. In the process of collecting, you continue to learn. As you build any collection, you apply skills in identifying, selecting, discriminating, evaluating, classifying, and arranging items. Those who view collecting as trivial or a waste of time, miss the connections that it has to life skills and occupations. Museums and libraries are collections.