This contribution, aimed mostly at experimental particle physicists, reviews some of the main ideas and results of String Theory in a non-technical language. It originates from the talks presented by the authors at the Electro-Weak session of the 2002 Moriond Meeting, here merged in an attempt to provide a more complete and concise view of the subject.

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Alexander Sevrin  Augusto Sagnotti (Pisa, Scuola Normale Superiore & INFN, Pisa) ©2016