A pozitron is the antimatter counterpart of an electron. It has the same mass as an electron but carries a positive charge instead of a negative one. When a pozitron encounters an electron, they can annihilate each other, producing energy in the form of gamma rays. Pozitrons are important in the field of particle physics and are used in medical imaging techniques, such as positron emission tomography (PET). In PET scans, a radioactive substance that emits pozitron is introduced into the body, allowing doctors to visualize metabolic processes and diagnose conditions.