Chemical processes are the series of steps that involve the transformation of substances through chemical reactions. These reactions can change the structure and properties of molecules, resulting in the formation of new substances. Common examples include combustion, where a fuel reacts with oxygen to produce heat and light, and photosynthesis, where plants convert sunlight into energy. In a chemical process, reactants are the starting materials that undergo change, while products are the new substances formed. Understanding these processes is essential in fields like chemistry, biochemistry, and environmental science, as they play a crucial role in everything from industrial manufacturing to natural ecosystems.