A synthesis reaction involves two reactants combining to form a more complex product. This type of chemical reaction can be represented by the general equation A + B → AB, where A and B are the reactants, and AB is the product. Synthesis reactions are fundamental in various chemical processes, including the formation of compounds in organic and inorganic chemistry. They are contrasted with decomposition reactions, where a compound breaks down into simpler substances. Understanding synthesis reactions is vital in fields ranging from materials science to biochemistry.