  The field of relativistic heavy-ion collisions is introduced to the
high-energy physics students with no prior knowledge in this area. The emphasis
is on the two most important observables, namely the azimuthal collective flow
and jet quenching, and on the role fluid dynamics plays in the interpretation
of the data. Other important observables described briefly are constituent
quark number scaling, ratios of particle abundances, strangeness enhancement,
and sequential melting of heavy quarkonia. Comparison is made of some of the
basic heavy-ion results obtained at LHC with those obtained at RHIC. Initial
findings at LHC which seem to be in apparent conflict with the accumulated RHIC
data are highlighted.
