Graph databases come with enhanced connectivity of data and whiteboardfriendly paradigm. It requires learning a new Graph Traversal Language, thatcrawls the network and brings informations. It's indeed a fresh new look athow we store web of data and search for it. We'll meet gremlin, from ApacheTinkerPop, which provides an abstract layer that make it easy to express yourbusiness logic without fighting with the code, and several Open Source graphdatabases, available for testing and toying.