Condensation polymers are any kind of polymers formed through a condensation reaction—where molecules join together—losing small molecules as byproducts such as water or methanol. Nylon is an example of condensation polymer that arise from the reaction of carboxylic acid and amine. DNA (deoxyribonucleic acid) is an organic polymer made by the condensation polymerization of repeating units (monomers) called nucleotides. Polyester is also a condensation polymer that arises from the reaction of carboxylic acid and an alcohol.