Fundamental concepts relevant to functional ceramics will be reviewed, including defect chemistry and reactions, Brouwer diagrams, Ellingham diagrams, Heckman diagrams, ionic and electronic transport, and tensor notation. The physics, materials, and applications for the following classes of functional ceramics will be covered: linear dielectrics, ferroelectrics and multiferroics, piezoelectrics, pyroelectrics, electrooptics, thermoelectrics, and semiconducting oxides. Selected technological applications will be reviewed including varistors, sensors, MEMs, capacitors, memories, transistors, night vision systems, positive temperature coefficient resistors, and electro-optic devices.