SDIO drivers?

[Maximus]

Hi,
  Just going through the linux kernel sources which has support  for
SD and MMC.

  Wondering whats the difference between SD and SDIO.

  What is meant by SDIO ?.  (SD + IO) ?.

  what  is meant  by  IO part?.

Are any SDIO drivers open source?.

Regards,
  Jo
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