  Large extra dimensions, of size of order of TeV^{-1} ~= 10^{-16} cm, arise
naturally in the context of supersymmetry breaking in string theory, while
strings at a TeV scale offer a solution to the gauge hierarchy problem, as an
alternative to softly broken supersymmetry or technicolor. In this short
review, we present consistent perturbative realizations of string theories with
large volume compactifications and low string tensions, and discuss their main
physical implications.
