Features of Captive Portal:

• Most captive portal keeps an idle and hard time out, i.e. a minimum time that a user has by which to interact or use services, in order to maintain basic level of security.
• Only selected MAC or IP addresses are allowed to access the network.
• Can place bandwidth restrictions on users.
• Different user authentication choices are provided along with https authentication.
• Capable of providing customizable content on the portal page.
• Allows for local user management options
• Requires customers to read and accept the acceptable usage policy.
• All Internet traffic is blocked until the user finishes the authentication process. In cases of a logout or other technical issues, a redirection url is provided.
• Can indirectly help in winning more customers for business, especially when free Wifi is provided.
  
• Browsing patterns also can be indirectly be captured using the same.
• Can help in generating revenue. The customizable page can be shown with deals and advertisements. Another way is to make customer pay for usage of the Internet plan.