I thought it was cool when a little kid walked by our office and asked us what a germ was? In trying to explain what a germ was I ended up with more questions (from the little one) than I had answers. He walked away totally disgusted, and I'm not sure if it was my explanation or the fact that we clean up germs from homes and offices that grossed him out.
In short, a germ is any potentially harmful microorganism that can cause disease. Germs are really tiny and often times very sneaky in that they may lay on any surface unnoticed. Three of the most common types of germs are bacteria, viruses, and fungi. Germs can "attack" plants, animals, and people. Therefore, it's really important to clean all of our surfaces well in order to avoid getting sick. I had mentioned that washing his hands often and helping around the house with chores were good ways to avoid picking up any germs. That's were I lost him. I sure hope I didn't scar him for life.