>>12911544In very, very, very basic terms (mostly because I myself do not really understand this shit):
You know Newton's third law? For every action, there is an equal and opposite reaction? That, but for matter. They have the same mass (just like opposing forces for Newton have the same intensity), but opposite charge, so an anti-proton has negative electric charge instead of positive charge. Positrons are the anti-particle of electrons, for example.
It is theorized that they might also have anti-gravity properties (the assumption is that they behave the opposite for gravity like they do for electromagnetism) but I don't think this was proven to any capacity, or even taken particularly seriously. That would however be the real deal if it is proven, since that would open up the way for space travel tech that we only dream of now.
As far as we know, aside from the flipped charge, the most important property of anti-matter is that it annihilates itself when in contact with normal matter (which is also in turn annihilated). The rest seems to be perfectly equal to normal matter.