OPENVPN

OpenVPN is a long-established VPN protocol that tunnels traffic over a single TCP or UDP port using OpenSSL/TLS for security. Client configuration lives in .ovpn files that combine remote endpoints, protocol selection, certificates and keys - sometimes with credentials or inline CA bundles. Its maturity, cross-platform support and ability to run over TCP port 443 keep it relevant even though handshakes are slower than newer protocols. Public .ovpn files often use shared credentials published alongside the profile.