  I review the present status of the Cosmic Microwave Background, with some
emphasis on the current and future implications for particle physics.
Conclusions are: gravitational instability in a dark matter dominated universe
grew today's structure; the Universe remained neutral until z<~50; the CMB
power spectrum peaks at 150<~l<~350; the large-scale structure of spacetime
appears to be simple; something like inflation is something like proven; we
will learn a great deal about cosmology, astrophysics and particle physics from
MAP and Planck.
