Intended for beginning graduate students or advanced undergraduates, this text provides a thorough introduction to the phenomena of high-energy physics and the Standard Model of elementary particles. It should thus provide a sufficient introduction to the field for experimeters, as well as sufficient background for theorists to continue with advanced courses on field theory. The text develops the Standard Model from the bottom up, showing the experimental evidence for each theoretical assumption and emphasizing the most recent results. It includes thorough discussions of electromagnetic interactions (of interest in particle detection), magnetic monopoles, and extensions of the Standard Model.