Harvard University Library is one of the largest and oldest academic libraries in the world, located in Cambridge, Massachusetts. Established in 1638, it serves the Harvard University community and the public, providing access to millions of books, manuscripts, and digital resources across its numerous branches. The library system includes over 70 individual libraries, each specializing in different subjects, such as the Widener Library, which is the main library and houses a vast collection of books and rare materials. The library supports research, teaching, and learning, making it a vital resource for students and scholars alike.