Penguin Group is one of the world's most influential publishers of English-language books, ranking tenth in the world of media. It was founded by Sir Ellen Raine in 1935, mainly to publish the world's best-selling books, non-fiction books, covering history, literature, science, reference books and other fields. In addition, Penguin also has many well-known brands, including Doreen Kindersley (DK), Puffin Press (Puffin), Ladybird (Ladybird) and so on.