Anti-matter is the same thing as normal matter but with opposite charge and magnetic momentum(magnetic momentum defines how the particle alignes itself to a magnetic field just as a compass needle pooint in some direction to a magnetic field).
It’s the magnetic momentum which makes it possible for neutral charged particles(such as the neutron) to have a anti-matter counter part. Even though they have the same electric charge(0) they have the opposite magnetic momentum.
(Note: Electromagnetic charge isn’t the only charge which can be reversed at anti-particles. Quarks, for example, also have colour charge which is reversed in their anti-particles.)
Normal matter(the things we are made up by) and anti-matter cannot meet. If one matter and one anti-matter particle would come together, they would annihalate each other.