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A captive portal describes the webpage that asks for authentication, payment, and/or acceptance of terms of the agreement in order to access the Internet via a public provided WiFi hotspot you might find at coffee shops, airports, business centers, or hotel lobbies. You may simply be asked to accept their terms or you might be prompted for payment.A captive portal describes the webpage (''and backend facility'') that asks for authentication, payment, and/or acceptance of terms of the agreement in order to access the Internet via a public provided WiFi hotspot you might find at coffee shops, airports, business centers, or hotel lobbies. You may simply be asked to accept their terms or you might be prompted for payment.# web server and possibly web application server or proxy server# web server and possibly web application server or proxy server (Apache + Squid)