File Handling
File handling is a fundamental programming concept that involves creating, reading, writing, updating, and deleting files on a computer's storage system. It provides mechanisms for programs to persistently store data beyond runtime, interact with external files, and manage file system operations. This includes working with various file formats like text, binary, CSV, JSON, and XML files.
Developers should learn file handling because it's essential for any application that needs to save user data, load configuration files, process log files, or exchange data with other systems. Specific use cases include building data import/export features, implementing configuration management, creating backup systems, and developing file-based databases or caches. Without file handling skills, developers cannot build applications that persist data across sessions.