Introduction: Basics of High Field Transport.- Semiconductor Superlattices.- Interband Optical Experiments on Bloch Oscillations: Basic Observations.- Interband Optical Experiments on Bloch Oscillations: Measurements of the Spatial Dynamics.- Emission of Terahertz Radiation.- Damping of Bloch Oscillations I: Scattering.- Damping of Bloch Oscillations II: Zener Tunneling.- Electrical Transport Experiments.- Bloch Oscillations in other Systems.- Future Prospects and Application Perspectives.