High entropy materials are known in metallurgy for a long time but only since 2015, they have emerged in the ceramic community gathering more and more interest due to their interesting properties. These promising materials are composed of no less than five cations that could lead to surprising catalytic properties and more. The interesting properties arise thanks to a single-phase stabilization due to the configurational entropy; furthermore, the combination of different anions and cations opens a large field of possible applications. They are now at the centre of a growing field considering the global energetic crisis, and the lack of precious metals for catalytic activities.