What is the best selling debut album?

According to the Guinness Book of World Records, the best-selling debut album of all time is "Appetite for Destruction" by the American hard rock band Guns N' Roses. It was released on July 21, 1987, and has since sold over 30 million copies worldwide. The album is notable for its hit singles, including "Welcome to the Jungle," "Sweet Child o' Mine," "Patience," and "Paradise City."