  These lectures were originally given at TASI and are directed at a level
suitable for graduate students in High Energy Physics. They are intended to
give an introduction to the theory and phenomenology of quantum chromodynamics
(QCD), focusing on collider physics applications. The aim is to bring the
reader to a level where informed decisions can be made concerning different
approaches and their uncertainties. The material is divided into five main
areas: 1) fundamentals, 2) fixed-order perturbative QCD, 3) Monte Carlo event
generators and parton showers, 4) Matching at Leading and Next-to-Leading
Order, and 5) Soft QCD physics.
