Atoms are the tiny building blocks of everything around us. They are so small that we can't see them with our eyes, but they make up all matter, including water, air, and even our own bodies. Each atom consists of a central nucleus, which contains protons and neutrons, surrounded by electrons that orbit around it. Different types of atoms combine to form molecules, which create the various substances we encounter daily. For example, two hydrogen atoms and one oxygen atom come together to form a water molecule. Understanding atoms helps us learn about chemistry and the world we live in!