Here are some important uses of VPN:
1) Use Public or Hotel wi-fi securely:
Public wi-fi offers no encryption security to its users, and your signals are broadcast for anyone savvy enough to eavesdrop, therefore some people use VPNs at Wi-Fi hotspots to prevent snoopers from collecting private information. Generally, the most effective way to keep your data from entering the wrong hands is by using a VPN service which makes all Internet use totally private and secure.
2) Secure Communication Between Sites:
Many businesses today have branch offices, and connect these branches to the main office over the Internet using a site-to-site VPN connection. For example, a businesses can enable workers with laptops on the road or at home to connect to the company network as if they were sat at a desk in the office. A company that has offices in two locations can connect them using a VPN across the internet so there appears to be one network. Linking remote sites with a main office lets users send and receive information via a secure connection. Employees can use file servers and printers which are not physically in the same office.
3) Bypass the Web Censorship and Content Surveillance:
Some countries put up firewalls to restrict what their residents see, hear, and share with other people within and beyond their borders. Connecting to a VPN server will enable you to 'tunnel out' of the censorship restrictions and access the full World Wide Web.
4) Access to the restricted contents:
By using a VPN service, you can manipulate your machine's IP address to specific location like US, therein you can unlock access to Netflix and Streaming Content from Outside the USA.
There are many VPN providers offering all kinds of VPN protocols like PPTP,L2TP,SSTP or OpenVPN that you can easily find the reliable one if you google for it.