VPN gives you a new IP address and encrypts the connection between your device and the internet so that no one can see what data you send and receive. But it won't make you anonymous because there are other ways for people to follow what you do online. Malware, like keyloggers, spyware, and so on, could be put on your device by hackers. Or, if you share too much online and use the same username everywhere, anyone who knows how to use Google well can find out a lot about you.