While “borrowing a book” might seem like a simple transaction, it taps into everyday social interactions in China. Libraries (图书馆, túshūguǎn) are important public institutions in China, heavily used by students and citizens of all ages for study and leisure. The act of going to the library to 借书 is a common and familiar activity. On a more personal level, borrowing and lending items, including books, is a casual way to build and maintain relationships with friends, classmates, and colleagues. Unlike the Western concept of “networking,” which can sometimes feel transactional, these small exchanges are part of the natural give-and-take that strengthens personal connections (关系, guānxi). Politely asking to borrow a book and remembering to return it promptly shows respect and reliability. It's a small, everyday action that reflects the community-oriented nature of social interactions.
借书 is a neutral, everyday term used in all informal and most formal contexts.