Cyclization is a chemical process where a linear molecule forms a ring structure. This transformation often occurs in organic chemistry, particularly in the synthesis of cyclic compounds. Cyclization can happen through various mechanisms, including intramolecular reactions, where parts of the same molecule react to create a loop. The resulting cyclic compounds can exhibit unique properties and reactivity compared to their linear counterparts. Cyclization is essential in the formation of many natural products, such as alkaloids and carbohydrates, and plays a crucial role in drug development and materials science.