  Recent experimental results obtained at the Relativistic Heavy-Ion Collider
(RHIC) will be discussed. Investigations of different nucleus-nucleus
collisions in recent years focus on two main tasks, namely, the detailed study
of sQGP properties and the exploration of the QCD phase diagram. Results at top
RHIC energy provide important information about event shapes as well as
transport and thermodynamic properties of the hot medium for various flavors.
Heavy-ion collisions are a unique tool for the study of topological properties
of theory. Experimental results obtained for discrete QCD symmetries at finite
temperatures are discussed. These results confirm indirectly the topologically
non-trivial structure of the QCD vacuum. Most results obtained during phase-I
of the RHIC beam energy scan (BES) program show smooth behavior vs initial
energy. However, certain results suggest the transition in the domain of
dominance of hadronic degrees of freedom at center-of-mass energies between
10-20 GeV. Future developments and more precise studies of features of the QCD
phase diagram in the framework of phase-II of RHIC BES will be briefly
discussed.
