Theory of Gauge Boson Structure

Based on an Invited Plenary Talk given at ``Workshop on Physics and Experiments with Linear $e^+e^-$ Colliders,'' Waikoloa, Hawaii, April 26--30, 1993. This paper reviews theoretical issues concerning the structure of vector bosons, with emphasis on deviations of triple-vector-boson interactions from the predictions of the Standard Model. Particular emphasis is on the role of gauge invariance in understanding the behavior of vector particles over energy scales large compared to their masses