Since 2013, the Dark Energy Survey (DES) has been mapping an entire octant of the sky to unprecedented depth, measuring the position on the sky, redshift and shape of over 200 million galaxies, together with thousands of galaxy clusters and supernovae. With this data set, DES is studying the properties of dark energy using four main probes: galaxy clustering on large scales, weak gravitational lensing, galaxy-cluster abundance, and supernova distances. The data from the first year of observations (DES-Y1), covering about 1500 sq. deg., have recently been analyzed to derive cosmological constraints from the first three probes, achieving an unprecedented precision in the determination of the cosmological parameters governing the growth of structure in the Universe. Furthermore, the first cosmological results from type-Ia supernovae discovered during the first three seasons of observations (DES-SN3YR) have recently been published. The talk presents and discusses all these results.