Libraries have historically served various missions over time. Originally, libraries maintained records and archives, but over centuries took on additional roles like promoting scholarship, religion, education, and national pride. In modern times, libraries emerged to support self-improvement as more people had leisure time during the Industrial Revolution. Today, libraries provide information to support individual improvement and education. Selection of library materials has also evolved as electronic resources have grown alongside traditional print materials, challenging librarians to maintain a balanced collection that meets the needs of various users.