Whispering gallery modes (WGMs) are a type of electromagnetic wave propagation that occurs in certain curved or spherical dielectric structures, such as optical microresonators or microcavities. These modes are characterized by the wave "whispering" around the circumference of the structure, leading to long photon lifetimes and high quality factors. Research in whispering gallery mode resonators has broad applications in areas such as sensing, telecommunications, and optical signal processing. These structures can be used as highly sensitive sensors for detecting small changes in the surrounding environment, as well as for enhancing light-matter interactions in quantum technologies. Overall, research in whispering gallery modes continues to explore new ways to harness their unique properties for a wide range of applications in optics and photonics.