Spin Caloric Transport is a dynamically growing field of research, which investigates the interplay between spin- and heat-based transport phenomena. The observation of the spin Seebeck effect (SSE) in a magnetic insulator demonstrates the crucial role of collective magnetization excitations, i.e., spin waves and their quanta, magnons, in spin caloric transport processes, and illustrates the conceptual distinction between this phenomenon and conventional thermoelectric generation. Most interesting and important is the conversion of a heat gradient into a magnon current and vice versa in a magnetic insulator. On a long time scale this may lead to the utilization of heat currents to support the transfer and processing of spin information.