Bob is the AI which controls and manages the Intrepid. He initially had no name (an interesting story on its own). When Amanda, his first human avatar, was installed, she determined that he needed a name and took to calling him Bob.
Bob is perhaps the most advanced AI ever created. He is the child of seventeen very unique and well regarded AIs. He also has portions of his neural network reflecting the minds of the Reddings. He is the first AI to be multi-nodal and to have each of those nodes be as powerful as the largest NSAI and remain sane and cogent.