20. According to the data of Sanya Library, by July 26th, 2023, there were 20 branches, including 9191Army Branch, Conch Garden Branch and Danzhou Community Branch. A library is an institution that collects, sorts out and collects books and materials for people to read and refer to. As early as 3000 BC, libraries appeared. Library has the functions of preserving human cultural heritage, developing information resources and participating in social education.