Since their advent in 2003, deep eutectic solvents have found applications in numerous fields where their properties as solvents, permitting the dissolutions of a large variety of solutes, and their being “green”, i.e., ecologically friendly as described in Chap. 1, gave them advantages over more conventional solvents. It is possible in the present chapter to present only examples of the numerous applications that have been proposed over less than a score of years that have passed since the first publication regarding the deep eutectic solvents.