What is the difference between a molecule vs. a compound?

A molecule is a group of two or more atoms bonded together, while a compound is a group of two or more atoms bonded together where the atoms are from at least two types of elements. All compounds are also molecules, but all molecules are not compounds.

For example, the formula H2O is both a molecule and a compound, but H2 is just a molecule since it only contains hydrogen atoms. In inorganic chemistry, the term molecule is typically restricted to compounds with a neutral charge, while the term ion refers to bonded atoms with either a positive or negative charge.