The Large Hadron Collider offers us the possibility to perform various
tests of our understanding of theoretical frameworks developed to
describe scatterings of hadrons where the energy of scattering is large.
In the talk the so called high energy factorization which is a framework 
within pQCD is going to be overviewed focusing on its latests
developments concerning matrix elements and evolution equations.
Furthermore phenomenological applications to jet physics at the LHC are
going to be presented.