Android TV does not by default have a user interface for setting up Enterprise Wi-Fi networks. These networks, use the Extensible Authentication Protocol (EAP), a framework for authenticating your device with the Wi-Fi network by providing both a username and password.
These types of networks are common at businesses, where only particular users should be accessing the network, or at universities where content is audited.
As stated above, though there is no user interface for connecting to these networks, the system has APIs for programmatically connecting. To aid those in the situations above, this app provides a useful interface for making connections.
There is another app that fulfills this need on Android TV, although I have found a number of issues with how it works.