Microresonators are small-scale resonant structures that are used in a variety of applications, including sensing, signal processing, and communications. These devices typically consist of a small cavity or waveguide that can trap and manipulate light, sound, or other forms of energy. By confining energy to a small space, microresonators can enhance the sensitivity and efficiency of various devices. Microresonators can be made from a variety of materials, including silicon, glass, and polymers, and can be designed to operate at different wavelengths or frequencies depending on the application. They are often used in optical and acoustic sensors, frequency filters, and frequency comb generators, among other applications. Overall, microresonators are a versatile and powerful technology that is continually being studied and improved upon for various practical applications in science and engineering.