DuckDuckGo (DDG) is a search engine, but unlike Google, it strongly emphasizes on protecting the privacy of its users by avoiding the filter bubble of personalized results, and subsequently, targeted advertising.
While Google is notorious for profiling and tracking users behavior online, DDG distinguishes itself by not profiling its users and sticking to the same search results for every given keyword search, and most probably returning the best accurate results, rather than results generated from individual preferences.
The source code is open sourced and hosted at GitHub under the Apache 2.0 License, though the core is proprietary. It sources its results from over 400 sources, including Yahoo! Search BOSS, Bing, and its own Web crawler (the DuckDuckBot); also uses data from crowd-sourced sites, including Wikipedia, to populate "Zero-click Info" boxes, usually above the results that display topic summaries and related topics.
DuckDuckGo has been growing steadily since launched in 2008, and has taken outside investment to scale its efforts to capitalize on growing international reach for its pro-privacy products, which Google has recently recognized the importance of offering consumers a private search option, by adding DuckDuckGo in the Chrome 73 available search engines for over 59 countries.
Google had quietly updated the lists of default search engines available per region on Chrome browser, while expanding the choice of search product users can select from the different markets around the world.
Again, the area of privacy is the big feature that DuckDuckGo sells itself on: As it doesn't log what you're searching for, and will only put up occasional advertising, which isn't personalized at all, and you can easily disable it.
What's more, even the sites you visited know nothing about the search terms you used to find them, and that's something other search engines do, while piecing together different clues from your browsing behavior and the data that your computer broadcasts publicly to sell their ads.
Additionally, DuckDuckGo runs the encrypted versions of a site by default. If you're among those of us who are tired of the big tech companies hoovering up data on us, DuckDuckGo will surely appeal to you.