Antimatter is a term in particle physics which has opposite charges to matter while having the same mass. If antimatter and matter collide, it can lead to the annihilation of them both, emitting gamma rays and nuetrinos. In physics, there is an antiparticle for every particle. For example, hydrogen has an electron (negatively charged) and a proton (positively charged), while antihydrogen has a positron (positively charged) and an antiproton (negatively charged). Antimatter was predicted from the expanded form of E=MC^2, which is E^2=M^2C^4. You can square root both sides to bring it back to the original form. And square roots have two answers so the negative answer can be antimatter. An example of where this happens is in nuclear fusion, which takes place in stars. In the immensely pressured and high temperature conditions (40 million oC!), two protons, forced to overcome their electrical repulsion, are smashed together, and by doing so become a proton, a neutron, a positron and some energy , the neutron being formed when the second proton splits into a neutron and an antimatter electron (a positron).
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