  The purpose of this article is to give a brief account of what we hope to
learn from the future CMB experiments, essentially from the point of view of
primordial cosmology. After recalling what we have already learnt, the
principles of parameter extraction from the data are summarized. The discussion
is then devoted to the information we could gain about the early universe, in
the framework of the inflationary scenario, or in more exotic scenarios like
brane cosmology.

Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology;High Energy Physics - Theory