The Dark Energy Survey (DES) is the state-of-the art imaging survey for dark energy. Since its first observing campaign, in 2013, DES has produced many exciting results, including: the most precise cosmological measurements from weak gravitational lensing of 400M galaxies, the first ever observation of the optical transient associated with a gravitational wave emitting astrophysical event (the binary neutron star merger GW1708117), and the first ever measurement of the rate of expansion of the universe using a dark gravitational wave standard siren (the binary black hole merger GW170814). After six years of data taking, on January 9 2019 DES completed its main survey observations. The collaboration now focuses on obtaining the most precise cosmological measurements, and prepare for target of opportunity observations of upcoming gravitational wave events. In this talk, I present an overview of the most exciting science produced by DES so far and discuss the prospects for the next few years before the start of the next-generation survey with the upcoming LSST instrument.