Ceramic capacitors, often referred to as ceramic caps, are a type of component used in electronic circuits to store electrical energy. They typically consist of two metal plates separated by a thin layer of ceramic material, which acts as the dielectric. This design allows for compact and efficient storage of electric charge. The term "CAP CER" likely refers to this specific type of capacitor, known for its widespread use due to its relatively low cost and ability to handle high-frequency signals effectively.