A fork is a split in whatever you want. Some examples:
A fork in the road. (Which do you choose? I suggest the one less traveled.)
The front or rear fork of the motorcycle. (One piece of metal that essentially is split in two to attach to both sides of the wheel axle.)
The fork as an eating utensil. (Usually has one solid handle and three or four splits for the prongs.)
The infamous pitch fork. (Looks like a large eating utensil but is useful for loading hay, grass, and other stringy objects.)