  We discuss in this set of lectures the structure of proton/neutron as
revealed through a study of form-factors. This is followed by a discussion of
the structure functions of proton/nuclear targets as measured in the deep
inelastic scattering (DIS) of leptons off these targets. We discuss the parton
model in DIS as well as outline the usage of parton model in processes other
than the DIS. We then go on to dicsuss the EMC effect: the nuclear dependence
of the structure functions. After a discussion of different models of the EMC
effect we end by pointing out the possibility of distinguishing between these
different models by studying the correlation between the $A$--dependence of
different hard processes and the EMC effect.
