Though Nicholas Sparks does not write Romance, he does write Love Stories. What is the difference you ask???
Though both have romantic elements, the sub-genres have different requirements. Love stories must use universal characters and settings. Romance novels are not bound by this requirement and characters can be rich, famous, or people who lived centuries ago, and the settings can be exotic. Love stories can differ in theme, romance novels have a general theme—”the taming of a man.” And finally, romance novels usually have happy endings while love stories are not bound by this requirement. Love stories usually end tragically or, at best, on a bittersweet note.