An oligomer is a molecule that consists of a small number of repeating units, known as monomers. These monomers are chemically bonded together, typically ranging from two to several dozen units. Oligomers can be found in various materials, including plastics and biological substances, and they play a crucial role in the properties of these materials. Oligomers differ from polymers, which are made up of many more repeating units. They can exhibit unique characteristics, such as improved solubility or specific mechanical properties, making them valuable in applications like adhesives, coatings, and biomedical devices. Understanding oligomers is essential in fields like materials science and chemistry.