A molecule is a group of atoms bonded together. It is the smallest unit of a chemical compound. It can make a chemical reaction. Molecules are held together by bonds. Bonds connect two atoms. With no bonds molecules wouldn't exist. It is very important for everyone to understand molecules because everything in the world is made up of them. Knowing what molecules are you could understand everything a lot better, once you understand you can fix old problems and discover new things including medicine and technology. If everyone knows what things are made of people would put more sense onto what they do and we would have a greater, more improved society.