Gravitational Lensing And MicrolensingThis book provides a comprehensive and self contained exposition of gravitational lensing phenomena. It presents the up to date status of gravitational lensing and microlensing, covering the cosmological applications of the observed lensing by galaxies, clusters and the large scale structures, as well as the microlensing searches in the Local Group and its applications to unveil the nature of the galactic dark matter, the search for planetary objects