A batch file is a simple text file that contains a series of commands for the Windows operating system. These commands are executed in sequence when the batch file is run, allowing users to automate repetitive tasks. Batch files typically have a `.bat` or `.cmd` file extension and can perform various functions, such as file management, program execution, and system configuration. Users can create and edit batch files using any text editor, like Notepad. By writing commands in a specific order, users can streamline processes, save time, and reduce the chance of errors. Batch files are especially useful for system administrators and power users who need to manage multiple tasks efficiently.