The proximity of the Sun allows us to make detailed measurements on the properties of solar magnetic fields. The long term systematic changes in the solar magnetic field pattern indicate a global origin. A global dynamo can be sustained by the interaction of solar convection with solar rotation. The rudiments of such a dynamo mechanism are discussed. Some recent issues arising out of new theoretical and observational developments are mentioned. The importance of magnetic topology for various solar phenomena is highlighted. Finally, a few methods of measuring solar magnetic fields are described.