Particles 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 solids, liquids, and gases. For example, a water molecule is made of two hydrogen atoms and one oxygen atom, which are all particles. There are different types of particles, such as atoms, molecules, and subatomic particles like protons, neutrons, and electrons. Each type of particle has its own properties and plays a unique role in how matter behaves. Understanding particles helps scientists explain everything from chemical reactions to the structure of the universe.