Conceived for a worldwide audience of students, scientists and industrialists, the CD-ROM Exploring matter with Synchrotron Light invites you to participate in a virtual tour of a synchrotron, it explains how a synchrotron works and details the innumerable applications. Widely used in the most advanced fields of research in physics, chemistry, biology, medicine and materials science, synchrotron light has participated in many of the greatest scientific discoveries of our times such as molecular biology and nanotechnology. Its interactivity and multiple-entry points permit each and every visitor to explore the CD-ROM according to their own knowledge and curiosity. Numerous animated images give the visitor the opportunity to vary specific parameters and to follow the results. In this way the visitor becomes involved in a virtual experiment.