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String compactifications with fluxes

We review the main features of string compactifications in the presence of non-trivial fluxes for various form fields in ten dimensions. After an elementary introduction to the topic, we focus the discussion on the geometrical description of the vacua and on the potential for the effective four-dimensional theory. We will especially review and emphasize the use of group structures to describe the ten-dimensional vacua and that of gauged supergravities for the effective theories.