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It’s one method of securing the data between two endpoints. A lot of organisations use them, particularly for staff who work from home. Think of a VPN as a tunnel between, say, your laptop and a server inside a corporate network. The tunnel encrypts all the data that flows through it, so the content can’t be understood or interpreted from the outside. Passwords, sensitive information, it’s all safe from prying eyes. A similar but different use has me using a VPN between this iMac and an exit point in the UK so that it looks as though I’m resident in the UK. The main use for this is to access local newspapers or web sites that use geo-blocking (more common in the US than the UK) and actually be able to see the content. You can use it to hide your location if you decide to download pirated material of course, but that’s only one use case.
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