  Parton distributions are an essential ingredient of the LHC program. PDFs are
relevant for precision Standard Model measurements, for Higgs boson
characterization as well as for New Physics searches. In this contribution I
review recent progress in the determination of the parton distributions of the
proton during the last year. Important developments include the impact of new
LHC measurements to pin down poorly known PDFs, studies of theoretical
uncertainties, higher order calculations for processes relevant for PDF
determinations, PDF benchmarking exercises with LHC data, as well as
methodological and statistical improvements in the global analysis framework. I
conclude with some speculative considerations about future directions in PDF
determinations from the theory point of view.
