Bestselling authors are writers whose books achieve high sales figures, often appearing on popular lists like the New York Times Best Sellers or Amazon Best Sellers. These authors can come from various genres, including fiction, non-fiction, and children's literature, and their works resonate with a wide audience. The success of bestselling authors can be attributed to factors such as engaging storytelling, effective marketing, and strong reader connections. Many bestselling authors, like J.K. Rowling and Stephen King, have built loyal fan bases, which helps sustain their popularity and sales over time.