What Does Startup Program Mean?
A startup program is a program or application that runs automatically after the system has booted up. Startup programs are usually services that run in the background. Services in Windows are analogous to the daemons in Unix and Unix-like operating systems.
Techopedia Explains Startup Program
A startup program is usually installed in order to monitor a device such as a printer or, in the case of software, to check for updates. Some of these programs are part of the operating system and most run in the background; in Windows, some of these can be seen as an icon in the taskbar.