Proper noun
PPTP
(computing) Initialism of point-to-point tunnelling protocol.
PPP and tunnels Derived protocols PPTP (Point-to-Point Tunneling Protocol) is a form of PPP between two hosts via GRE using encryption ( MPPE ) and compression ( MPPC ). Source: Internet
They also will require authorization for any type of Virtual Private Network (VPN) technology (for example; PPTP, L2TP, GRE Tunneling, OpenVPN, and most other protocols that allow you protect your information). Source: Internet