Eduroam (education roaming) is a secure worldwide federated network access service developed for the international research and education community. UW-Madison is member of eduroam, so you can use your NetID credentials at any eduroam-enabled school and get instant network connectivity. This also means visitors from participating schools can get wireless network connectivity at UW-Madison, and UW-Madison users can use it at other eduroam institutions.
To configure eduroam on your mobile device or computer, follow the instructions in the UW–Madison DoIT Knowledge Base article: https://kb.wisc.edu/helpdesk/page.php?id=25020