Cloning, as it relates to genetics and genomics, involves using scientific methods to make identical, or virtually identical, copies of an organism, cell or DNA sequence. The phrase “molecular cloning” typically refers to isolating and copying a particular DNA segment of interest for further study.
Cloning is a word we use to describe a molecular process of making millions or billions of copies of a single molecule. It's different from the uses of the terms "cellular cloning" or "organism cloning" that are used in the reproductive genetics universe. We use molecular cloning to amplify, or make many copies of, genes or proteins or other micro molecules that amplifies the signal and allows us to study these molecules in a laboratory.