Every time, when something happens on the computer, it is recorded. And it can be used in different ways. For example, sometimes it assists technical specialists to find out the core problem when the computer has stopped an action occurs on the computer, this event is recorded in the record. All the servers have possibilities of storing massive amount of data that is processed on the computer.
“No logging” policy, which many of VPN suppliers offer to you implies that they do not gather the information from your activities in the Internet. It’s obligatory for VPN suppliers to have this factor. As it was mentioned above, the only data, which they may possess about you are two IP addresses (yours and the server’s) and the method of your payment.