When someone gets hold of your IP address, they can determine a lot of information about you – mainly, your country and your city.
Many countries around the world mandate internet service providers (ISPs) to keep records of your online activities. When your IP is masked, it is extremely difficult for your ISP or the government to monitor what you do on the internet. They won’t know what you do online, and the ISP won’t have any data to transfer or sell to advertisers and marketers.