Whats Wrong with Using Public Wi-Fi?

Nothing as long as you keep the computer you are connecting to a public network with secure there should be nop problems.

I use public wifi all the time and never had any problems.
 
The issue lies in the fact that you are connected to a network with unknown clients. Being on the same network, those clients have a certain amount of access to your computer. The level of access is varied by machine and security steps taken by the owner. Are most people sitting in a coffee house elite hackers waiting to prey on your machine? Probably not but it only takes one to pass some weird infection to your machine and steal your data.
 
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