"CD" is a basic command used Change directories on the hard drive or backup devices.
"CD.." moves you back one directory (Also known as the parent directory).
"CD Windows" would move you into the windows directory (That is if you are in it's parent drive)
"CD C:\Windows" would move you immediately into the Windows directory is it was on the C: drive.
"CD /?" will give you further help when using the command.
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