Private Internet Access is one of the only VPNs that lets you choose your encryption method based on whether you want speed, safety, or both.
VPNs are often used to let remote workers get into their company's private corporate network even when they're not physically in the office, and they work the same for the average consumer.
You get two main benefits from using a VPN. First, by using a server hosted by your VPN, you can pretend to be in a different country.
Second, and perhaps more importantly, your VPN provider encrypts all of the traffic going to and from your computer, so it's much more difficult for someone else to tap into your communications or see your browsing history.