Libraries have changed a great deal in the last twenty years. In the past, people went to a library mainly to borrow printed books and to read quietly. Today, many libraries still do this, but they also offer much more. Visitors can use free computers and wireless internet, borrow e-books on their phones, and join classes about languages or computer skills. Some libraries have rooms where children listen to stories, and others have quiet areas where students can prepare for exams. Some people believe that libraries will disappear because information is now available online. However, librarians argue that this is not true. Not everyone has a fast internet connection at home, and many people need help to find reliable information among so many websites. In this way, the library is no longer only a house of books; it is also a center that serves the whole community.

Question: What is the main idea of the passage?