A synthesis reaction, also known as a combination reaction, occurs when two or more reactants combine to form a single product. This type of 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 common in both organic and inorganic chemistry and are essential for creating various compounds. These reactions are fundamental in many processes, including the formation of water from hydrogen and oxygen gases. Synthesis reactions are also crucial in biological systems, such as the creation of glucose during photosynthesis, where plants combine carbon dioxide and water using sunlight.