What is one of the functions of a background service in Windows?

A background service in Windows is designed to operate without the need for user interaction or a visible user interface. This allows these services to run tasks or processes in the background, such as system updates, file indexing, or network management, often efficiently and without disrupting the user's experience. Background services can start automatically when the system boots up and continue to run even if no user is logged into the system.

In contrast, the other options do not accurately describe the functions of background services. Upgrading system hardware pertains to physical components and is not a function of software services. Requiring user input for each task contradicts the very nature of background services, which are meant to operate independently of direct user engagement. Installing new applications is typically an activity that requires a visible interface and user consent, which again does not align with the operational characteristics of background services.