A monomer is a chemical compound consisting of a single molecular unit. These molecules are typically small and simple in structure and can be used as building blocks for making polymers. Monomers are linked together through chemical reactions to form long polymer chains. These polymer chains can have a variety of properties and be used in various applications, such as plastics, textiles, paints and coatings, medicines and much more. The use of monomers and polymers has led to innovations and advances in many areas of daily life.