The row of 2x20 pin headers has been on Raspberry Pi board since the Rpi 2, including Raspberry Pi Zero (Some version is not soldered, though) - those are the GPIO (general purpose input/output) pins and for those of us who like to hack electronics they are where the real fun is. By programming the Pi, you can twiddle those pins high or low, send and receive I2C and SPI data, and access the 3V and 5V power rails.
This cable is to extend the 40-pin GPIO on Raspberry Pi board to external devices or T-cobbler socket. This is the same cable that we include in the T-cobbler breakout.
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