Dielectric resonators are materials that can store and resonate electromagnetic energy. They are typically made from non-conductive materials, such as ceramics or plastics, which allow them to vibrate at specific frequencies when exposed to an electric field. This property makes them useful in various applications, including microwave communication and signal processing. These resonators are often used in devices like oscillators and filters to improve performance and efficiency. By selecting the right dielectric material and shape, engineers can design resonators that operate at desired frequencies, making them essential components in modern electronics and telecommunications.