Dielectrics are materials that do not conduct electricity but can support an electric field. When placed in an electric field, dielectrics become polarized, meaning their positive and negative charges shift slightly in response to the field. This property makes them useful in various applications, such as capacitors, where they help store electrical energy. Common examples of dielectrics include glass, plastic, and ceramics. These materials are essential in electronics and electrical engineering, as they can prevent unwanted current flow while allowing electric fields to influence nearby components. Their ability to insulate and store energy is crucial for the functionality of many devices.