ZenMate is a widely-used and long-running VPN (virtual private network) that allows you to browse with what you do hidden from one end to the other: you might be browsing the web in Indonesia, but all of your steps will pass through Japan, then Russia, on their way to a server in America. This provides security from prying eyes who might try to find out who you are and what you're doing from your Internet connection. VPNs can also allow you to avoid censorship: using ZenMate you can, for example, browse webpages not available in your current country.