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Re:Let's start using DuckDuckGo more often by jmathai on Friday December 30, 2016 @12:01PM (#13285418)
It's sort of a meta search engine that utilizes other search indexes. Here's a post from the founder.

https://duck.co/forum/comment/27893

Edit, that's about 5 years old. The current page on Wikipedia provides a more recent explanation.

"DuckDuckGo's results are a compilation of "about 50" sources,[42] including Yahoo! Search BOSS; Wikipedia; Wolfram Alpha; Bing; its own Web crawler, the DuckDuckBot; and others."

https://en.wikipedia.org/wiki/DuckDuckGo#Overview

Re:Let's start using DuckDuckGo more often by Bedon292 on Friday December 30, 2016 @12:06PM (#13285451)
They actually say hundreds of sources now on https://duck.co/help/results/sources and specifically call out Bing, Yahoo, and Yandex for search results.
Re:Let's start using DuckDuckGo more often by low_battery on Friday December 30, 2016 @01:27PM (#13286083)
It is a meta search engine. Note that they never mention the share breakdown of these "sources". What percentage of queries DDG itself answer? Probably very few.