The set of features in each VPN varies from service to service, so we can only generalize about what you may see when you open the Settings pane. But our APMG VPN experts encourage you to read through the documentation and try clicking some buttons. The best way to learn how to use a tool is to try, after all.
Most VPN services include some kind of Kill-Switch feature, which prevents your computer from transmitting or receiving information if the VPN becomes disconnected. It's useful for preventing little bits of data sneaking through unencrypted.
Most services offer an option to select a VPN protocol. This can be intimidating, since they have weird names and companies rarely provide information about what these are, and what changing the protocol will do.
In general, this is something you can leave alone.
But if you're interested, the protocol we recommend is OpenVPN. It's open-source, so it has been picked over by many eyes for any potential vulnerabilities. IKEv2 is also a good, secure option if OpenVPN is not available. Note that on some platforms, such as macOS and iPhone, OpenVPN is not always available, because of additional restrictions placed on developers. The best VPNS for iPhone give you access to the latest and greatest protocols available on that platform.
You might see an option to use the WireGuard protocol in your VPN app. WireGuard is experimental technology, and isn't strictly speaking "finished" in any sense. Even in its current state, however, it appears to provide incredible speeds unlike any current VPN solutions. It's very likely the future of VPNs, but it's best to be patient and wait for it to be completed and thoroughly vetted by researchers before rushing to adopt it.
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