How are positrons and electrons different?
opposite charge, different ways of being produced
a positron has a positive charge, while the electron has a negative charge. these charges have the same magnitude.
this means that when annihilation occurs, the total charge is conserved. the 2 or more gamma rays produced have no charge.
positrons can be generated through radioactive decay (through weak interactions) or through pair production, while electrons can be found in all atoms, including stable ones.