Overview on calorimetry

In this paper I want to review the state of the art of calorimeter developments. I will focus on innovative solutions in calorimetry at the technology frontier and I will favor calorimeters for High Energy Physics detectors. The field in which calorimeters find their application is so broad that this short review does not do justice to all ongoing projects. Instead, this paper shall be considered as a collection of currently hot topics on the subject.