Not an ignorant question. SOW cable is not what you tie a hog with :) .
It is cable with stranded copper conductors jacketed with rubber compound encased with a high quality rubber jacket which is black (at least all I have bought).
It is waterproof and approved for wet locations.
I use it where there is movement involved with cabling i.e. pan and tilt cameras.
It is usually rated for a wide temperature range -40 to 90 degrees C. and remains flexible.
It makes great extension cords.