Alcohol
Alcohol is a compound that consists of carbon, oxygen, and hydrogen arranged in a certain way. It is liquid at room temperature and if you put it in the freezer. Ethyl alcohol (ethanol) is the kind used for drinking. Isopropyl alcohol is rubbing alcohol. The molecules have a carbon backbone with a hydroxyl group.
Sometimes humans use alcohol to do things that they otherwise would not do.
It is flammable and also used as a gasoline additive.
Alcoholic beverages are a mixture of ethyl alcohol, water, and flavorings. They are described in "proof", with 200 proof being 100% alcohol, 80 proof being 40% alcohol, etc.