Tom Hollingsworth writing for Network Computing writes:

It seems like all IT hardware is now being defined by software. In the network, software defined networking (SDN) is a daily topic of debate. On the storage side, discussions about abstraction and programmability are starting to be lumped into the category of Software Defined Storage (SDS). And now a term is emerging to denote the convergence of all these things into something much bigger: the software defined data center (SDDC).

Read more: Software Defined Data Center: Marketing or Meaty?