  Neutrinos are neutral, spin-$\frac{1}{2}$ particles which undergo only weak
interactions. The experimentally observed phenomenon of neutrino oscillation
establishes the fact that neutrinos are massive and there is mixing between
different neutrino flavours. This constitutes the first unambiguous hint
towards the physics Beyond Standard Model (BSM). In the BSM theories, the
neutrino mass terms in the Lagrangian lead to the non-diagonal neutrino mass
matrix in the flavour basis which depends on neutrino mass and mixing
parameters. Thus knowledge of the neutrino oscillation parameters and
understanding the underlying symmetries of the neutrino mass matrix are very
important as they can give an insight to the new physics beyond Standard Model.
Therefore the measurement of different oscillation parameters and studying the
structure of the neutrino mass matrix are some of the main goals in neutrino
physics at present. In this thesis we have studied the potential of
present/future neutrino oscillation experiments and synergy between them to
determine the unknown parameters in the neutrino sector in the light of current
experimental results. We have also studied the phenomenological consequences of
texture zeros in the neutrino mass matrices in the presence of a sterile
neutrino.
