With the advent of Large Hadron Collider, particle physics entered a new energy domain. In this regime the scattering cross sections for variety of observables exhibit strong growth with collision energy. Since the deep inelastic experiments in 90's it has been understood
that such universal behavior is related to the rapid increase of the gluon density in the proton.
In this talk, I will discuss the experimental and theoretical evidence for the presence of the large gluon component in the proton at high energies. Next I will discuss the  need for resummation of perturbative series which include the  logarithms of energy in order to have reliable predictions at high energies and  implications for the observables in deep inelastic scattering and in hadronic collisions.  I will also discuss the applications of these resummed calculations to neutrino cross sections and atmospheric neutrino flux which are relevant for IceCube neutrino observatory.