  Deep eutectic systems (DES) have received considerable attention in the past
5 years of research. Up to 2013 little had been explored over these systems
both in which concerns fundamentals and applications. The definition of a deep
eutectic system is still controversial and in this manuscript we highlight the
different definitions proposed in the literature and discuss what, in our
opinion, should be pursued in order to have an agreement in the scientific
community studying this field. From the definition of DES to its applications
also interesting changes have been observed in the topics published. From
electrochemistry to newer applications, such as cryopreservation, the field is
evolving as new outcomes on DES properties are unraveled. We herein present and
discuss new trends on DES research and present some perspectives on what we
consider to be the most promising applications of DES at industrial scale.
