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Chemistry is the scientific study of matter, its properties, composition, structure, and the changes it undergoes during chemical reactions.
Matter is anything that has mass and occupies space. It exists in three primary states: solid, liquid, and gas.
The three main states of matter are solid (definite shape and volume), liquid (definite volume but indefinite shape), and gas (neither definite shape nor volume).
An element is a pure substance that cannot be broken down into simpler substances by chemical means and is made of only one type of atom.
A compound is a pure substance composed of two or more different elements chemically bonded in fixed proportions.