KEKB is a particle accelerator located in Japan, specifically in Tsukuba, Ibaraki Prefecture. It was designed to collide electrons and positrons at high energies, allowing scientists to study fundamental particles and forces. The facility has contributed significantly to the field of particle physics, particularly in understanding CP violation, which helps explain the matter-antimatter imbalance in the universe. The KEKB accelerator consists of two rings: the High Energy Ring (HER) and the Low Energy Ring (LER). These rings enable the precise control of particle collisions, leading to groundbreaking discoveries. KEKB was operational from 1999 until 2010 and has since been succeeded by the SuperKEKB accelerator, which aims to further enhance research capabilities.