Hadronic jets are ubiquitous at particle colliders. They originate from energetic quarks and gluons produced during a collision and thus provide a probe of the underlying hard interaction. Effective field theories provide a powerful tool to study jet processes which span several distinct energy scales. I give an overview of the basic ideas behind the effective field theory description of jets. I then show several example applications: jets in e+e- colliders, Higgs production with jets at the LHC, and the size and inner structure of jets.
