  Recent measurements of inclusive and semi-inclusive deep inelastic scattering
in electron-proton collisions at HERA are reviewed. These measurements are used
to determine the parton distribution functions (PDFs) of the proton, a
necessary input to theory predictions for hadron colliders. An introduction to
the PDF determination with an emphasis on HERA PDFs is presented. Theory
predictions based on HERAPDF are compared to a selection of recent LHC and
Tevatron measurements. The impact of jet and charm production measurements on
the PDFs is discussed.
