Every browser has a description like “Mozilla/5.0 (Linux; Android 8.1.0; SM-T580) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36” called User Agent. You can set this value to something else, but be careful. If you set it to something that does not exist, then it makes it more likely to be identifiable. Or some things could potentially not work right if it expects a specific operating system, in example when downloading files. Usually not a big deal.
So ultimately you want to set this value to something that exist and something that is used by many people. There are addons which can make this process much easier or even change it automatically after some time period in example.
Chameleon at sereneblue.github.io/chameleon/ is such an addon for the browser. There are lot of other alternatives, I used a few of them in the past, but stopped using them because there was here and there trouble. If you do, I recommend to install this addon from the addon store of your browser and not from the website, but that is just my personal recommendation.