What Is Batch Scripting?

A batch file is nothing more than a plain text file saved with a .bat (or .cmd) extension. Each line in the file is a command that Windows' command-line interpreter, cmd.exe, reads and executes in order, from top to bottom. Instead of manually typing the same sequence of commands into a console every time, you write them once into a script and let cmd.exe run them automatically whenever the file is executed.

Batch files are executed by cmd.exe, the Windows Command Processor, which is a direct descendant of MS-DOS's COMMAND.COM from the 1980s. That heritage explains why batch syntax can feel dated: commands like DIR, COPY, and DEL trace straight back to DOS. Despite its age, cmd.exe ships with every version of Windows, which is exactly why batch scripts remain a reliable, install-nothing way to automate tasks such as login scripts on a domain-joined PC or simple system administration jobs.

Batch scripting is intentionally simple compared to PowerShell or VBScript. PowerShell works with real .NET objects, has structured error handling with try/catch, and supports rich data types like arrays and hashtables out of the box. Batch has none of that -- variables are just strings, there's no true array type, and error checking relies on inspecting %ERRORLEVEL% after each command. What batch trades away in power, it makes up for in simplicity: no modules to import, no execution policy to configure, and it runs identically on any Windows box.

In practice, batch scripts are still widely used for build automation (kicking off a compiler and copying output files), deployment scripts (stopping a service, replacing files, restarting it), cleanup jobs (deleting old log files past a certain age), and scheduled tasks wired up through Windows Task Scheduler. Because they need no runtime beyond what Windows already provides, they're a low-friction choice for straightforward, repetitive administrative work.