A virtual private network (VPN) can be an important tool in your online protection routine, but only if you know exactly what a VPN can and can't do. Used properly, a VPN can enhance your security and privacy, but it's not a replacement for other tools.
The basic concept behind a VPN is simple: software running on your PC encrypts every bit of network traffic before it reaches your PC's network adapter, then it sends that encrypted data to a remote server that's operated by the VPN service. That remote server sends the data to the public internet. The encrypted "tunnel" between your device and the VPN server is what makes the network both virtual and private. Many corporate networks will only allow remote connections over a VPN. Still, you can also buy consumer-grade VPN software for connecting to untrusted networks, such as those found in airports and coffee shops.

The benefit of this type of network is twofold. First, it prevents anyone on your local network from spying on your internet traffic. That's especially important if you're using a Wi-Fi network that's not under your control. 

Second, it allows you to disguise your location, which prevents some types of tracking and also makes it possible to bypass geographic restrictions on some services. If you're in Europe and want to watch a movie that's restricted to the US, you might be able to fool the streaming service by connecting to a VPN in the US.

VPNs are resource-intensive and can take a huge toll on your network bandwidth, which is why you should only employ them when you need them.

https://www.zdnet.com/article/will-using-a-vpn-help-protect-me-from-malware-or-ransomware/