How do I transfer files between two computers that don't share any network?

If you need to transfer files between two computers that are not connected to the same network, you can copy the files to removable media (e.g., a flash drive, CD, or DVD), and then transfer them physically.

Alternatively, with a Mac, you may be able to connect another Mac as an external hard drive. For instructions, see How do I use my Macintosh as an external hard disk for another computer?