Startup execution is the practice of configuring a program to launch automatically when a user logs in or when the operating system starts. On Windows, this can be done through startup folders, registry run keys, services, scheduled tasks, or vendor utilities that register themselves during installation.
In cyber security, startup execution matters because it gives software persistence. Legitimate tools use it for sync clients, security agents, and hardware companions, but attackers also abuse the same mechanisms to survive reboots and keep unwanted code active. A program that appears at every logon can be harder to remove, harder to notice, and more likely to blend in with normal system behavior. Defenders watch startup locations during software inventory, incident response, and baseline checks to spot unexpected additions. In cases where a peripheral or installer drops an app that launches automatically, startup execution is often the sign that the trust boundary has been crossed.