This document provides an overview of x-ray physics and the x-ray imaging process. It describes how x-rays are produced via an x-ray tube, how they interact with the patient's tissues to form an image based on absorption and scattering, and how the resulting latent image is developed and processed on radiographic film or digital detectors. The key factors that influence image formation including kilovoltage, milliamperage, distance and density/atomic number of tissues are also summarized.