This chapter summarizes some of the most recent developments in transamidation reactions. We start with a historical background trying to show the reader that transamidations are long known reactions, but, unfortunately, they have gained a privileged place only recently. We then make a presentation of the most important mechanistic studies, leading to the study of direct transamidations, which means transamidations induced by activation of the carbonyl group, in other words, the interaction of the carbonyl with a promoter that increases its electrophilicity. We then turn our attention to a relatively new way for activation of amides, which is changing their geometry. Notably, we will discuss the use of twisted amides as acyl sources. In each section, we try to cover or introduce all the existing concepts that lead to the most important developments and permit the chemists to use the transamidations in their future synthetic plans.