New York has one or more bookstores. Bookstores are essentially retail outlets for books, magazines, maps and stationery (though this may vary from store to store). They are run by booksellers or bookmen. The kind of books stocked by the store may vary widely. Some may be general in nature, and stock all kinds and genres of books. Usually, the books are sorted by type into various sections. Student bookstore on university campuses usually focus on providing course textbooks and scholarly books. Second-hand bookshops may also be present in New York, where one can buy old books at cheaper prices. Retail bookstores may be either independent, or part of a chain of stores of regional or national character. Some of the well known chains include Barnes & Noble, Book Off USA, Books-A-Million, Follett's, Hastings Entertainment, Hudson Booksellers (usually at airports and railway stations), Powell's Books and many more. Many bookstores are designed to be inviting and have interesting architectural innovations. In spite of the onslaught of the digital media, books continue to have an enduring appeal.