Any material which occupies space and has mass is known as matter.
The three states of matter are: solids, liquids and gases.
Solids- A solid has a definite shape and definite volume. Example – wood, stone, iron, Ice etc.
Liquid – A liquid has a definite volume but not definite shape. Example – water, Juice, milk, oil, etc.
Gases- A gas have neither definite volume nor definite shape. Example- Oxygen, Carbon dioxide etc.