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from Wikipedia:

The Apple IIc, the fourth model in the Apple II series of personal computers, was Apple Computer’s first endeavor to produce a portable computer.

The end result was a luggable 7½ pound notebook-sized version of the Apple II that could easily be transported from place to place. The c in the name stood for compact, referring to the fact it was essentially a complete Apple II computer setup (minus display and power supply) squeezed into a small notebook sized housing.

While sporting a built-in floppy drive and new rear peripheral expansion ports integrated onto the main logic board, it lacked the internal expansion slots and direct motherboard access of earlier Apple IIs, making it a closed system like the Macintosh. However that was the intended direction for this model—a more appliance-like machine, ready to use out of the box, requiring no technical know-how or experience to hook up and therefore attractive to first-time users.

Useful links: Serial Cable Pinout & Apple Disk Transfer ProDOS – Apple 2c FAQ – Apple DOS 3.3 Dump – DOS Serial Transfer

source: wikipedia