Best-selling

A bestseller is a book that is included on a list of top-selling or frequently-borrowed titles, normally based on publishing industry and book trade figures and library circulation statistics; such lists may be published by newspapers, magazines, or book store chains. Some lists are broken down into classifications and specialties (number one best selling new novel, nonfiction book, cookbook, etc.). An author may also be referred to as a bestseller if their work often appears in this category. Well-known bestseller lists in the U.S. are published by Publishers Weekly, USA Today, New York Times and the Washington Post. Most of these lists track book sales from national and independent bookstores, as well as sales from major internet retailers such as Amazon.com and Barnes & Noble.

In everyday use, the term bestseller is not usually associated with a specified level of sales, and may be used very loosely indeed in publishers' publicity. Books of superior academic value or literary merit tend not to be bestsellers, although there are exceptions. Lists simply give the highest-selling titles in the category over the stated period. Some books have sold many more copies than current "bestsellers", but over a long period of time.

Blockbusters for films and chart-toppers in recorded music are similar terms, although, in film and music, these measures generally are related to industry sales figures for attendance, requests, broadcast plays, or units sold.

Particularly in the case of novels, a large budget and a chain of literary agents, editors, publishers, reviewers, retailers, librarians, and marketing efforts are involved in "making" bestsellers, that is, trying to increase sales.

...
Wikipedia