[nvrspyx]

As far as I know (hence I could be wrong), that’s outdated. Since Yahoo was purchased by Verizon, it is predominately Bing results with some Yahoo/Oath/Verizon Media results sprinkled in, considering it now predominantly uses Bing itself. Yandex is no longer used and Wikipedia is just part of their knowledge cards or whatever they call them, like StackOverflow is. In other words, it’s mainly Bing with DDG’s own crawler used specifically for the knowledge cards and to modify the priority of results pulled from Bing.

With that said, I do believe they have a special deal with Microsoft to not pass along any information. Instead, the only information Microsoft sees is DDG requesting the results on behalf of the users (aka Bing/MS just sees DDG’s IP, etc. which can be seen sometimes in the results, not the knowledge card, when you search for “what’s my IP” in DDG). My one gripe though is that they’re definitely not as transparent as they could be about where and how they source results.