what makes a novel a classic?

A novel can be considered classic when it is further interpreted years after the book has been published. The reoccurring discussion and thematic examination of a novel, portrays how it is "classic" enough to further investigate. Some novels that come to mind as classic to me include, "Hamlet", "Romeo and Juliet", and "A Tale of Two Cities". This novels for me exemplify a taste of classicism due to the fact that they have been inspiring for modern day plots of many movies, art, songs, and other novels as well. These novels are also dubbed classic for me because they are well-known by people of all ages, and therefore fit into the definition of classic as well.