Molecules are tiny groups of atoms that bond together to form the building blocks of everything around us. They can be simple, like a molecule of oxygen made of two oxygen atoms, or complex, like DNA, which carries genetic information in living organisms. Molecules are essential for creating different substances, from the water we drink to the food we eat. In our daily lives, we encounter many types of molecules. For example, table salt is made of sodium and chloride molecules, while sugar consists of carbon, hydrogen, and oxygen molecules. Understanding molecules helps us learn about chemistry and how different materials interact with each other.