Collecting or Hoarding?

What's the difference? I remember having a mismatched collection of to-be thrown away things (popped balloons, plastic, newspaper pictures, unused straws, etc...). Hoarding is what I consider an unhealthy obsession. Whereas a collection is something you do because you are intrigued by what you collect. For example,  I was fascinated by the prospect of people throwing things away. Now adays i collect soda tabs. Not because it's an obsession. But because I find them interesting and fun to collect.