Bonjour works in the background to handle tasks that would otherwise require manual IP or DNS configuration:

Bonjour 3.1.0.1 is widely recognized as a "stable legacy" version. It is frequently installed as a prerequisite for:

The 3.1.0.1 version remains the most prevalent and widely deployed iteration of Bonjour for the Windows platform. It features a compact and runs seamlessly as a background service via the executable mDNSResponder.exe .

Version 3.1.0.1 was released on October 29, 2015. While older, it remains the most prevalent version found on Windows systems because it is frequently bundled with legacy Apple software installers. Why is it on my Windows PC?

Apple historically bundled Bonjour with iTunes. If you have an old iTunes installer (e.g., iTunes 12.1.2 or earlier), you can extract Bonjour 3.1.0.1:

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Most Windows users do not download Bonjour 3.1.0.1 standalone; instead, it is bundled with other software. If you find this version on your PC, it was likely installed by one of the following applications:

This allows applications to query the network for specific types of services. For instance, an app can broadcast a request asking, "Are there any AirPrint printers available?" Bonjour will return a list of all compatible devices and their port numbers. Why is Bonjour Installed on Your Windows PC?