Embracing the enhanced features of an ebook, the authors provide a primer on quantum optics for students and those wanting an introduction to the topic. Whereas standard texts employ complex mathematics and static images, the authors use interactivity to augment understanding via a visual hands-on experience. Forty interactive figures allow exploration of different themes, while multiple representations give a window on quantum dynamics both at the microscopic and macroscopic level, connecting understanding across length scales. A historical introduction and examples from modern research set these concepts firmly into both original and contemporary research context. This is an ideal text for final year undergraduate quantum optics students, and new graduate students in AMO physics, and researchers in physics and electrical/optical engineering. Part of IOP Series in Quantum Technology.