Meraki

A captive portal (also known as a ‘“splash page”) is what a user sees when they first associate with a Wi-Fi SSID and open a web browser to surf the Internet. When a captive portal is
configured, all Internet traffic will be re-directed to a particular URL and a user is required to take specific actions before their traffic is able to pass through to the Internet. In this fashion, a service provider controls the initial Internet experience for their end customer can request the customer
take a variety of actions such as: fill out a survey, purchase a billing plan, view an advertisement, or accept a set of terms and conditions before being allowed onto the Internet.
A captive portal facilitates direct audience engagement at a critical point during a user’s Internet experience, and is therefore a powerful medium that can be used for a flexible range of use cases.