  We present a subset of experimental results on charge fluctuation from the
heavy-ion collisions to search for phase transition and location of critical
point in the QCD phase diagram. Measurements from the heavy-ion experiments at
the SPS and RHIC energies observe that total charge fluctuations increase from
central to peripheral collisions. The net-charge fluctuations in terms of
dynamical fluctuation measure $\nu_{(+-,dyn)}$ are studied as a function of
collision energy (\sqsn) and centrality of the collisions. The product of
$\nu_{(+-,dyn)}$ and $\langle N_{ch} \rangle$ shows a monotonic decrease with
collision energies, which indicates that at LHC energy the fluctuations have
their origin in the QGP phase. The fluctuations in terms of higher moments of
net-proton, net-electric charge and net-kaon have been measured for various
\sqsn. Deviations are observed in both $S\sigma$ and $\kappa\sigma^2$ for
net-proton multiplicity distributions from the Skellam and hadron resonance gas
model for \sqsn $<$ 39 GeV. Higher moment results of the net-electric charge
and net-kaon do not observe any significant non-monotonic behavior as a
function of collision energy. We also discuss the extraction of the freeze-out
parameters using particle ratios and experimentally measured higher moments of
net-charge fluctuations. The extracted freeze-out parameters from
experimentally measured moments and lattice calculations, are found to be in
agreement with the results obtained from the fit of particle ratios to the
thermal model calculations.
