  QCD critical point is a landmark region in the QCD phase diagram outlined by
temperature as a function of baryon chemical potential. To the right of this
second-order phase transition point, one expects first order quark-hadron phase
transition boundary, towards the left a crossover region, top of it lies the
quark gluon plasma phase and below it the hadronic phase. Hence locating the
QCD critical point through relativistic heavy-ion collision experiments is an
active area of research. Cumulants of conserved quantities in strong
interaction, such as net-baryon, net-charge, and net-strangeness, are suggested
to be sensitive to the physics of QCD critical point and are therefore useful
observables in the study of the phase transition between quark-gluon plasma and
hadronic matter. We review the experimental status of the search for the QCD
critical point via the measurements of cumulants of net-particle distributions
in heavy ion collisions. We discuss various experimental challenges and
associated corrections in such fluctuation measurements. We also comment on the
physics implications of the measurements by comparing them with theoretical
calculations. This is followed by a discussion on future experiments and
measurements related to high baryonic density QCD matter.
