A temp directory is a writable location used by operating systems and applications to store short-lived files such as installers, unpacked scripts, caches, and working data. On Windows, examples include paths under %TEMP% or %TMP%. These files are usually meant to exist only during a task and may be removed automatically after use.
In cyber security, temp directories matter because they are convenient staging areas for both legitimate software and attackers. Malware often drops scripts or payloads there to blend in with normal activity, avoid fixed paths, or execute from a location that users and tools expect to be noisy. Defenders watch for unusual file creation in temp folders, especially numbered scripts, repeated launches of native script hosts, or execution tied to remote-management tools. A temp directory is not suspicious by itself; the risk comes from the sequence of creation, execution, and cleanup.