Matter is a science term that basically encompasses all the stuff in the universe that has mass and takes up space. Generally, only three forms of matter are studied: solids, liquids, and gases. There is a fourth natural form of matter called plasma. This is not the stuff in your blood, instead it is hot fluid of charged particles called ions. These states of matter in order of least energy to greatest energy are:
Other states of matter that have been produced in the laboratory include:
Quark-gluon plasma, which requires extremely high temperatures and pressures.
For information about each of the natural states of matter, see