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PPTP is a network protocol for creating a VPN tunnel. Because of several security vulnerabilities, PPTP is getting obsolete with time. But it does provide excellent speed and is widely used for accessing geo-restricted sites. It is immensely popular, especially among the Windows users.
A VPN Tunnel is a link between two network endpoints which provides encapsulation and encryption for the data flowing through it. This is essentially required to hide your identity as well to secure your data. VPN tunnel requires different vpn protocols like PPTP, L2TP, IPSec etc