this book surveys recent developments in some of the most important topics in particle physics and cosmology, including neutrino physics, cp violation, b-physics, baryogenesis, dark matter, inflation, supersymmetry, unified theories, large extra-dimensions and m-theory. it contains excellent lectures and talks presented at the nato asi 2000 in cascais-portugal by some of the most prominent physicists working in this exciting field of research and it is specially useful for ph.d. students and postdocs, and physicists in general who want to know about the latest developments in particle physics and cosmology. it also provides important results given by experimentalists in neutrino physics, cp violation and dark matter.