Polymer chemistry is the branch of chemistry concerned with the synthesis, structure, properties, and reactions of polymers. Polymers are large macromolecules composed of many repeating structural units called monomers. The formation of polymers typically occurs through polymerization reactions, which can be classified into addition polymerization, ring-opening polymerization, or condensation polymerization, depending on the mechanism of bond formation. These chemical processes allow for the creation of materials with diverse and finely tuned characteristics, ranging from elastic and rigid solids to viscous liquids. The resulting polymeric materials are fundamental components in various technologies, finding applications in advanced materials, adhesives, coatings, biomedical devices, and consumer goods due to their customizable strength, thermal stability, and flexibility.