Anything that has mass and occupies space is called matter.
A matter is made up of tiny particles that are too hard to seen with a powerful microscope.
A matter is made up of tiny particles which are invisible to the naked eye.
The particles of matter are locomotive in nature because they have kinetic energy. The motion of the constituent particles intensifies with a surge in temperature.
Example: A glass of water has many particles which are very minute. Water particles can actually be divided into even smaller units. The pieces of matter that result from dividing a water particle are no longer water. They are the examples of the basic units of matter called atoms.