With ESA's upcoming JUpiter ICy moons Explorer (JUICE) mission to Jupiter and Ganymede, this book provides a fascinating and timely summary of our current knowledge about Ganymede: the largest moon in the Solar System and the only one with an intrinsic magnetic field. Written by a team of multidisciplinary experts spanning geology, space physics and habitability, it provides up-to-date knowledge about Ganymede. The history of its discovery, formation, surface, atmosphere and space environment are discussed in accessible language and supported by the enormous amount of data obtained by Galileo, the Hubble Space Telescope and earlier missions. The latest surface maps of Ganymede are also presented, providing an invaluable reference for graduate students and researchers working in planetary science.