Molecules are groups of two or more atoms joined together. They can be made from the same type of atom or from different types. Examples include oxygen (O₂) and water (H₂O). Molecules are found in many common substances.

Molecules exist in solids, liquids, and gases around the world. They are present in air, water, food, and living organisms. Different molecules have different structures and forms.

Molecules make up both living and non-living things. They are part of many materials used in daily life. Molecules are important units of matter found everywhere.