**OpenVPN** is an open-source VPN (Virtual Private Network) solution designed for secure and encrypted communication over the internet. It provides a flexible, scalable, and secure way to establish private connections, making it a popular choice for businesses, remote access, and site-to-site networking.

Features of OpenVPN:

• Secure encryption and authentication using OpenSSL.
• Supports both TCP and UDP protocols for flexible networking.
• Cross-platform compatibility with Linux, Windows, macOS, and mobile devices.
• Ability to bypass firewalls and work in restricted network environments.

To check the installed version of OpenVPN, run: $ openvpn --version

Disclaimer: OpenVPN is an open-source project developed by OpenVPN Inc. It is provided under the GPL license and is widely used for secure network access, privacy, and corporate VPN solutions.