Point-to-Point Tunneling Protocol (PPTP) is one the common protocols for implementing a Virtual Private Network (VPN). PPTP has been packaged with versions of Microsoft Windowssince Windows 95. The protocol is also supported by OS X, Android, iOS, many mobile phones, and various flavors of UNIX / Linux. Because so many devices have built-in PPTP support, it has been a popular protocol choice for VPNs.
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