For these socks, L knitted each part with a different color. The resultant rainbow is both beautiful and an excellent look at what exactly makes up a sock.
Starting at the top, there is a dark yellow cuff hugging the ankle. This cuff is followed by a dark green leg.

Unless it is a very special sock.

After the heel turning, some magic happens and that heel turning, heel flap, and leg get connected to the orange portion, which is known as the gusset. The gusset leads into the blue foot of the sock. The final section is known as the toe. The last two sections of the sock are my favorite, mostly because I can remember what they are called.
