Structure of Proton

Electron–proton scattering in elastic and highly inelastic region is reviewed in a unified approach. The importance of parity–violating scattering due to electro–weak interference in probing the structure of proton is emphasized. The importance of longitudnal spin–spin asymmetry as well as parity violating longitudnal asymmetry to extract the structure functions of proton in both regions are discussed. The recoil polarization of proton in the elastic scattering is also discussed.