Electrocaloric effect: An Introduction -- Constitutive Modeling of Electrothermal Properties in Polar Dielectric Materials and Thin Films -- Electrocaloric Effect in Relaxor Ferroelectric-based Materials -- Electrocaloric Effect in Multilayer Structures -- Electrocaloric Polymers -- Lead-free and exotic Electrocaloric Materials -- Indirect and Direct Measurements of the Electrocaloric Effect -- New Approaches to Electrocaloric-Based Multilayer Cooling -- Energy Harvesting from Temperature: use of Pyroelectric and Electrocaloric Properties.