It’s like what we think of as normal matter. The difference is that the electrical charge is the opposite.
Atoms have got electrons in them. Electrons have a certain mass (9.11×10^-31kg) and a certain negative electrical charge. The first antimatter particle discovered was something called the position. This particle was found to have the exact same mass as an electron. It was also found to have the same amount of charge as an electron, but it had a *positive* charge instead of the electron’s *negative* charge.
Other antiparticles exist too, and these are just like that. They have then same properties as the ‘normal’ ones but with the opposite electrical charge.
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