  In this work, we have discussed the recent developments that have taken place
to understand the differences in the weak $F_{2A}^{Weak} (x,Q^2)$ and
electromagnetic $F_{2A}^{EM} (x,Q^2)$ nuclear structure functions. Also we
present the results of our work on nuclear medium effects on $F_{2A}^{Weak}
(x,Q^2)$ and $F_{2A}^{EM} (x,Q^2)$ for a wide range of $x$ and $Q^2$. These
results have been obtained using a microscopic nuclear model, where to
incorporate nuclear medium effects, Fermi motion, binding energy, nucleon
correlations, mesonic contributions from pion and rho mesons and shadowing
effects are considered.
  The calculations are performed in local density approximation using
relativistic nucleon spectral function. We have also compared the theoretical
results with the recent experimental data on electromagnetic and weak structure
functions. Furthermore, we have studied the nuclear medium effects in
Drell-Yan(DY) process and present the results for differential cross section,
and the results are compared with the data of E772 experiment.
