Ceramic capacitors are a type of capacitor that use ceramic materials as their dielectric. They are widely used in electronic circuits due to their small size, low cost, and ability to filter out unwanted frequencies. MLCC stands for Multi-Layer Ceramic Capacitor, which is a specific type of ceramic capacitor that has multiple layers of ceramic material stacked together. This design allows MLCCs to have high capacitance values while still being relatively small in size.