This book presents an overeview on the various aspects of multi-terminal DC (MTDC) grids. The major portion of the book is focused on the MTDC grids constructed based on the technology of the voltage-sourced converter high-voltage DC (VSC-HVDC) transmission, but some lights are also shed on the medium- and low-voltage DC networks. The applications, potentials and advantages of the MTDC grids are investigated. In particular, applications of the MTDC grids for integration of offshore wind farms are discussed and several topologies of the MTDC grids for offshore wind farms integration are...