The second edition of this successful textbook provides an up-to-date introduction both to distributed algorithms and to the theory behind them. The clear presentation makes the book suitable for advanced undergraduate or graduate courses, while the coverage is sufficiently deep to make it useful for practicing engineers and researchers. The author concentrates on algorithms for the point-to-point message passing model and includes algorithms for the implementation of computer communication networks. Two new chapters on sense of direction and failure detectors are state of the art and will provide an entry to research in these still-developing topics.