I want to know the answer to the following question:
What is the purpose of a variorum?
All the background I'm provided with is that "The Bible and the works of William Shakespeare have often been the subjects of variorum editions, although the same techniques have been applied with less frequency to many other works, such as Walt Whitman's Leaves of Grass, and the prose writings of Edward Fitzgerald.". Is that enough to answer the question?
Answer: no