mkdir

Create new folder(s), if they do not already exist.

SYNTAX
      mkdir [OPTION] folder...

      mkdir "Name with spaces"

OPTIONS
  -m, --mode=MODE   set permission mode (as in chmod), not rwxrwxrwx - umask
  -p, --parents     no error if existing, make parent directories as needed
      --verbose     print a message for each created directory

DESCRIPTION
mkdir creates the standard entries . (dot) for the current folder 
and .. (dot dot) for its parent

Any folder name that includes spaces may appear in some applications
as "Name%20with%20spaces"

Related commands:

cd - Change Directory
rm - Remove files
rmdir - Remove folder(s)

Equivalent Windows NT commands:

MD - Create new folders