date-fns is a popular JavaScript library that provides a comprehensive set of functions for manipulating and formatting dates. It allows developers to perform tasks such as adding or subtracting time, comparing dates, and formatting them in various styles. The library is lightweight and modular, meaning you can import only the functions you need, which helps keep your application efficient. One of the key features of date-fns is its simplicity and ease of use. The functions are designed to be intuitive, making it accessible for both beginners and experienced developers. Additionally, date-fns supports internationalization, allowing for date formatting in different locales, which is essential for global applications.