The Model C Stellarator, constructed and operated at the Plasma Physics Laboratory of the Princeton University, was the last and most powerful of the stellarator devices operated at Princeton during the period from 1953 to 1969. Experiments on Model C treated the problem of anomalous plasma loss and tested major innovative concepts including the divertor and radiofrequency heating. This review focuses on portions of Model C work that have strongly influenced present-day research and understanding of toroidal confinement in stellarators and tokamaks.