Here's a breakdown:

* Matter: Anything that takes up space and has weight. It's the "stuff" that makes up everything around us.

* Mass: A measure of the amount of matter in an object. It's a fundamental property and doesn't change based on location or state (solid, liquid, gas).

Key point: Mass is a scalar quantity, meaning it only has magnitude (how much). It doesn't have a direction.

Example: A rock has a certain mass. If you move the rock to another planet, its mass stays the same even though its weight changes due to different gravity.