Standard 1,8 meter USB cable suitable for Arduino or USBTinyISP programmer.

FTDI cable is a simple way to connect TTL interface devices to USB. TTL-232R is a USB - TTL serial converter cable which will allow for a simple way to connect serial TTL level devices to USB.

It is not just a dumb cable. The TTL-232R uses a FT232RQ chip which is housed within the USB "A" connector. A 1.8 meter (6 foot) cable is terminated with a 6 way 0.1" pitch header socket which provides access to the Transmit (Tx), Receive (Rx), RTS#, and CTS#, as well as VCC (5V) and GND.