Virtual Private Network (VPN)
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A Virtual Private Network (VPN) is a type of virtual network. Unlike a home network, the devices in a VPN are not physically connected to each other or a central router via network cables or Wi-Fi.
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Use a VPN connection on public networks to encrypt your communications.
Access sensitive data in remote networks via a VPN.
Protect yourself from being tracked online.
Public Wi-Fi Behavior | BSI
Most people are happy to have free Wi-Fi when traveling. However, access to public networks in cafés or at the airport is usually unencrypted. Be more cautious here. If possible, use a secure connection, which you can identify by the abbreviation in the address bar.
Source: BSI