Q.
What is a Chain?
A. According
to the Merriam-Webster Dictionary, it is a connected, flexible series
of links, typically of metal, used especially for holding objects together
or restraining or for transmitting mechanical power.
Q. What is a Sprocket?
A. According to the Merriam-Webster Dictionary, it is any of various
toothlike projections arranged on a wheel rim to engage the links of
a chain.