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Question:

What technology would you use to prevent eavesdropping in the case that you are sitting in a coffee shop that offers WiFi and you want to use their WiFi to access the Internet, but you are concerned about someone eavesdropping on this insecure connection?

A VPN
Explaination

VPN - a virtual private network that encrypts data between your client and the VPN server - is the technology used to create a secure tunnel.