Cut-Up Four-Piece:
Cutting a whole chicken, without giblets, into two breast quarters with wings attached, and two leg quarters.
Six-Piece Cut-Up
This is produced by cutting up a whole bird, without giblets, into two split breasts (with back and rib portions), 2 drumsticks, and two thighs (with back portion). Tail may or may not be present.
Eight-Piece Cut-Up
This is produced by cutting up a whole bird, without giblets, into two split breasts (with back and rib portions), 2 drumsticks, 2 thighs (with back portions), and 2 wings. Tail may or may not present.
Images courtesy USDA.