Rare decays refer to highly uncommon processes in particle physics where particles decay into lighter particles through processes that are typically forbidden or highly suppressed in the standard model of particle physics. These decays are of great interest to physicists as they provide a unique opportunity to probe the inner workings of the standard model and search for new physics beyond it. Rare decays can reveal information about the fundamental forces and particles governing the universe and can help test the predictions of theoretical models. Studying rare decays requires highly sensitive detectors and sophisticated analysis techniques to identify and study these rare events.