Via Quora, there are 23 answers on this posting – so this is just one – read all of them here: “#1 — Google tracks you. We don’t. You share your most intimate secrets with your search engine without even thinking: medical, financial and personal issues, along with all the day to day things that make you, well, you. All of that personal information should be private, but on Google it’s not. On Google, your searches are tracked, mined, and packaged up into a data profile for advertisers to follow you around the Internet through those intrusive and annoying ever-present banner ads, using Google’s massive ad networks, embedded across millions of sites and apps. So-called incognito mode won’t protect you either. That’s a myth. “Incognito” mode isn’t really incognito at all. It’s an extremely misleading name and in my opinion should be changed. All it does is delete your local browsing history after your session on your device, but does nothing from stopping any website you visit, including Google, from tracking you via your IP address and other tracking mechanisms like browser fingerprinting. Here’s the fine print:

To keep your searches private and out of data profiles, the government, and other legal requests, you need to use DuckDuckGo. We don’t track you at all, regardless what browsing mode you are in. Each time you search on DuckDuckGo, it’s as if you’ve never been there before. We simply don’t store anything that can tie your searches to you personally, or even tie them together into a search history that could later be tied back to you. For more details, check out our privacy policy…”