Which VPN service/app is best for safeguarding my browsing activity.

Want to know how to select the best VPN application? Know how VPN services work and which factors you should consider while selecting the right VPN service for yourself.

I want to know which VPN app is best for securing my browsing activity. Also, I want to know whether the service provider or the search engine knows about the browsing history as data is exchanged between sites.

How exactly VPN functions, please explain in layman's language and not in very technical terms.