UNC 3/8" Socket Cap Screw High Tensile 12.9 Self Colour DIN912

UNC 3/8" Socket Cap Screw High Tensile 12.9 Self Colour DIN912 UNC 3/8" (16 T.P.I.), Coarse Pitch, High Tensile (12.9), Self Colour DIN 912. What is a socket cap screw/ bolt?. A screw is fully threaded and a bolt is partialy threaded.