A VPN shields your online activity from internet service providers (ISPs). That's handy for anyone who needs to make use of public Wi-Fi networks since it's not always clear who owns those networks and even whether it's safe to connect. The encrypted connection prevents anyone on the same local network as you-and even the person who runs the network-from getting any information about what you do online. All your web traffic is sent through this encrypted connection, exits the server, and then rejoins the internet as normal. When you switch on a VPN, it creates an encrypted connection between your Mac and a remote server operated by the VPN company.
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