Tests of QCD using jets, bosons plus jets, and top quark production at colliders

Quantum Chromodynamics (QCD) is actively studied at present collidersusing several physics signatures as probes. Results from measurementsdone at LHC, but also from the legacy analyses of Tevatron and HERAdata, are discussed. Jets are the main tool for such investigation, asexperimental evidence for emission of gluons or quark production inQCD-dominated processes. Jet production in multijet events or inassociation with vector bosons is discussed. The investigation of theproduction of heavy quarks, and in particular of the top quark, is ofspecial importance both for the physics implications in the search fornew phenomena and for its unique characteristics from the QCD point ofview.