

Preserve the responsiveness of other network applications.

Asynchronously transfer files in the foreground or background.BITS is exposed through the Component Object Model (COM).

It is most commonly used by recent versions of Windows Update, Microsoft Update, Windows Server Update Services, and Systems Management Server to deliver software updates to clients, Microsoft’s anti-virus scanner Microsoft Security Essentials (later merged to and renamed to Windows Defender) to fetch signature updates, and is also used by Microsoft’s instant messaging products to transfer files.
