reliable methods for photocatalysis and to introduce them to a larger audience. The fundamental concepts of photophysics are introduduced and laboratory set-ups are described, enabling newcomers to the field to instantly apply these new tools in synthesis. Rather than aiming for comprehensive coverage, solutions for challenging transformations in synthesis applying visible light and suitable dyes are presented. A team of pioneers and leaders in the field has been assembled, who discuss both the practical and conceptual aspects of this rapidly growing field. Scope, limitations, and mechanism of the reactions are covered and key experimental procedures are included.