Cascade reactions are a series of chemical reactions where the product of one reaction serves as the reactant for the next. This process allows for the efficient conversion of starting materials into desired products through multiple steps. Each reaction in the cascade can enhance the overall yield and reduce the need for isolation of intermediates. These reactions are commonly used in organic chemistry and biochemistry, often involving enzymes or catalysts to facilitate the transformations. Cascade reactions can lead to complex molecules from simpler ones, making them valuable in the synthesis of pharmaceuticals and natural products, such as those found in plants or microorganisms.