B+ decay is a type of radioactive decay that occurs in certain unstable particles, specifically B mesons. In this process, a B+ meson transforms into a K meson and a positron, which is the antimatter counterpart of an electron. This decay also produces a neutrino, a nearly massless particle that interacts very weakly with matter. The significance of B+ decay lies in its role in understanding the Standard Model of particle physics. By studying this decay, scientists can gain insights into the behavior of fundamental particles and the forces that govern their interactions. This research helps improve our knowledge of the universe's structure and the nature of matter.