A VPN (virtual private network) protects awareness of your browsing activity between your computer and the site you are using. It is most important if you are concerned with awareness of your browsing activity in a public location (e.g., coffee shop) or object to your ISP from collecting and possible selling information about your browsing activity. Individuals regard external awareness of this personal information with different degrees of concern.
Mozilla has just announced a built in VPN you can use to secure your browsing history. The service will cost $5 a month after the initial “try it out” phase.