Matter is a physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy. Matter has two parts: pure substance and mixture.
Pure substance is a sample of matter with both definite and constant composition with distinct chemical properties.
A glass of water, a diamond, and gold is an example of a pure substance. Substances can be classified in two groups, an element and a compound.
Elements are a part or aspect of something abstract, and especially one that is essential or characteristic.
For example some elements are sodium, hydrogen, helium, and gold.
Compounds are a thing that is composed of two or more separate elements; a mixture.
For example some compounds are carbon dioxide (carbon and oxygen), common salt (sodium, chlorine), sulphate (copper, sulphur, oxygen), and hydrogen chloride (chlorine and hydrogen).
A mixture is a substance made by mixing other substances together.
For example trail mix, soil,cookie dough, and m&m's.