Every time you visit a web site, your web browser sends lots of information to that site. The decision on what to do with that data, if anything, is down to the remote site. Some sites store it for marketing and analytics purposes. Other use it for technical reasons, such as to adjust the display to the capabilities of your computer or the size of the screen.
The information that your browser sends is comprehensive. It always includes your IP address, from which the name of your internet service provider can be discerned. It also includes certain technical details about your computer and browser, as well as your location. As you can see from the screen shot included here, it even contains details of which fonts you have installed.
The harvesting of large amounts of such data is not going to go away any time soon. Indeed, Twitter now collects details about the apps installed on your smartphone and lets advertisers use the information to target their messages towards people who use a certain application.
If you want to find out what data your web browser is broadcasting to every site you visit, try going to https://tenta.com/test/ in your favourite browser. This site simply retrieves all the data and then displays it for you to see.
The site in question is, of course, promoting a new browser which claims to block such information from being sent. It even claims to include a free built-in VPN. I'm still evaluating their claims so I'm not yet ready to say whether or not you should try their browser. But the page which reveals your data is both safe and enlightening.
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