String Theory first published in 1998 comprises two volumes which provide a comprehensive and pedagogic account of the subject. Volume 2 begins with an introduction to supersymmetric string theories and presents the important advances of recent years. The first three chapters introduce the type I type II and heterototic superstring theories and their interactions. The next two chapters present important recent discoveries about strongly coupled strings beginning with a detailed treatment of D-branes and their dynamics and covering string duality M-theory and black hole entropy. The final chapters are concerned with four-dimensional string theories showing how some of the simplest string models connect with previous ideas for unifying the Standard Model. They collect many important results on world-sheet and spacetime symmetries. An appendix summarizes the necessary background on fermions and supersymmetry. An essential text and reference for graduate students and researchers interested in superstring theory. Language: English