Structure of proton and nuclei

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.