From their website:
DuckDuckGo is an Internet search engine that emphasizes protecting searchers’ privacy and avoiding the “filter bubble” of personalized search results. DuckDuckGo distinguishes itself from other search engines by not profiling its users and by deliberately showing all users the same search results for a given search term. DuckDuckGo also emphasizes getting information from the best sources rather than the most sources, generating its search results from key crowdsourced sites such as Wikipedia and from partnerships with other search engines like Yandex, Yahoo!, Bing and WolframAlpha [emphasis mine].
Privacy. Avoiding the filter bubble. Need I say more?
Google is mad about it. So is everyone else. With NSA issues of privacy so close in the news, I love DuckDuckGo on premise. They are a private company.
Schwartz, Barry. “DuckDuck Go Announces Redesign and New Features.” Search Engine Roundtable Blog, Retrieved 5/23/2014.
DuckDuckGo Community Platform: For hows and FAQs on the search engine.