A relaiivhtic electron passing through a bending magnet emits elecrmmagnetic radiation in the forward direction with an extremely narrow opening angle. The photon density of this so-called 'synchrotron radiation' is correspondingly high and has, in addition, a very broad radiation spectrum. Because of its outstanding properties, synchrotron radiation has become a very powerful tool in basic research and technical applications. The required relativistic electron beam is provided by utilizing modem as a dedicated synchrotron radiation source is the storage ring. Very important for a high quality of radiation is strong focusing of the electron beam circulating in the accelerator. The theory of this low-emittance optics is presented, including some important examples of magnet lattices. Inserting special wiggler and undulator magnets into a storage ring gives a significant increase of the photon density. In particular, the uiiuuiaiui r u a g r i ~~a pruviue veiy nigii i i i i c i i ~i i i ~~ ui ~uitereiti syncnrurrun iautauuii. A logical consequence of this coherent undulator radiation was the development of the free electron laser (FEL), which is described in the last section of this review.

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A new internet-based synchrotron experiment for students is presented. A polarimeter and computer software have been developed for measuring via the internet the X-ray magnetic circular dichroism of PtFe around its Pt L II and L III absorption edges. From the experiment, students can examine the X-ray magnetic circular dichroism of a thin PtFe foil utilizing circular-polarized synchrotron radiation emitted by the superconducting asymmetric wiggler at the synchrotron radiation source DELTA of the University of Dortmund.