Presents an interdisciplinary discussion of stellar and solar astronomy, focussing on the recent findings in stellar magnetism and sunspots.

Preface; 1. Formation and decay of sunspots; 2. Solar magnetism; 3. Origin of solar activity; 4. Formation and evolution of starspots; 5. Stellar magnetism; 6. Starspots and stellar activity; 7. Observational techniques; 8. Unified approach in understanding sun and starspots; Author index; Subject index.