Here is a list of 'Best Selling" authors in the world, with estimated sales of at least 100 million books. Shakespeare tops the list with estimated book sales of between 2 billion and 4 billion. Click on the author's name to see a selection of their books.

William Shakespeare (4 billion), Agatha Christie (4 billion ), Barbara Cartland (1 billion), Harold Robbins (750 million), Georges Simenon (700 million), Enid Blyton (600 million), Danielle Steel (570 million), Dr. Seuss (500 million), Gilbert Patten (500 million), Leo Tolstoy (413 million), J. K. Rowling (400 million), Jackie Collins (400 million), Horatio Alger, Jr. (400 million), R. L. Stine (400 million), Corin Tellado (400 million), Sidney Sheldon (400 million), Aleksandr Sergeyevich Pushkin (357 million), Stephen King (350 milion), Louis L'Amour (330 million), Dean Koontz (325 million), Erle Stanley Gardner (325 million), Jin Yong (300 million), Jirō Akagawa (300 million), Janet Dailey (300 million), Nora Roberts (300 million), Robert Ludlum (290 million), Frédéric Dard (290 million), Stan and Jan Berenstain (260 million), John Grisham (250 million), Zane Grey (250 million), Irving Wallace (250 million), J. R. R. Tolkien (250 million), Karl May (200 million), Mickey Spillane (200 million), C. S. Lewis (200 million), Kyotaro Nishimura (200 million), Charles Dickens (200 million), Ann M. Martin (180 million), Ryōtarō Shiba (180 million), Arthur Hailey (170 million), Gérard de Villiers (150 million), Beatrix Potter (150 million), Michael Crichton (150 million), Richard Scarry (150 million), James Patterson (150 million), Clive Cussler (150 million), Alistair McLean (150 million), Astrid Lindgren (145 million), Jeffrey Archer (140 million), Dan Brown (120 million), Eiji Yoshikawa (120 million), Catherine Cookson (120 million), Norman Bridwell (110 million),
The following have max sales of 100 million - Paulo Coelho , Roald Dahl , Evan Hunter , Andrew Neiderman , Roger Hargreaves , Anne Rice , Robin Cook , Wilbur Smith , Erskine Caldwell , Eleanor Hibbert , Lewis Carroll , Denise Robins , Xueqin Cao , Ian Fleming , Hermann Hesse , Rex Stout , Anne Golon , Ken Follett , Frank G. Slaughter , Edgar Rice Burroughs , John Creasey , James Michener , Yasuo Uchida , Seiichi Morimura , Debbie Macomber , Mary Higgins Clark ,

EBOOKS
An e-book (short for electronic book, or EBook), also known as a digital book, is an e-text that forms the digital media equivalent of a conventional printed book, sometimes restricted with a digital rights management system. An E-book, as defined by the Oxford Dictionary of English, is "an electronic version of a printed book which can be read on a personal computer or hand-held device designed specifically for this purpose". E-books are usually read on dedicated hardware devices known as e-Readers or e-book devices. Personal computers and some cell phones can also be used to read e-books.