The Windows command shell is a text-based interface for running operating-system commands on a Windows host, such as cmd.exe or commands launched through scripting tools. It lets an administrator or program start processes, inspect files, change settings, and automate tasks without using the graphical interface.
In cyber security, the command shell matters because attackers often abuse it after gaining access. A remote access trojan or another implant may invoke the shell to execute commands, enumerate the system, download payloads, create persistence, or delete evidence. Defenders watch for unusual shell activity because it often signals post-compromise control, especially when the process tree, parent process, or command line looks abnormal. Logging and monitoring command execution can reveal intrusion activity early.