2 Gb per month.. it would be gone in 15 mins sometimes by me.. it leakes ipv6 and others. it is not fully anonym. but for normal browsing it is more than enough.
A vpn masks your ip and encrypts your internet traffic. Meaning no one can see your internet traffic. You can also bypass geo restrictions by choosing what country you want to appear in. It can also be used to protect you from ddos. Another useful feature is it allows you to use unsecure wifi securely because it encrypts your traffic from your device to the server. Meaning anyone trying to see your traffic will just see encrypted stuff. You can also enable a firewall on your vpn stopping threats before it even gets to you. (purevpn offers this).
I had some issues with this software, and just wait till you try to uninstall it.
if you really need a VPN I personally would opt for PureVPN: https://www.purevpn.com/