The `close()` method is commonly used in programming to release resources that are no longer needed. For example, when working with files in Python, calling `close()` on a file object ensures that any changes are saved and the file is properly closed, preventing data loss or corruption. It also frees up system resources, allowing other processes to access the file. In addition to files, `close()` can be used with network connections and database connections. By invoking `close()` on these objects, developers can ensure that connections are terminated safely, which helps maintain system stability and performance. Properly closing resources is a best practice in software development.