True, though this is a little out of date, DDG has built much of their own cache now. Bing is still their failover, but they've gotten a lot more independent. That said, I don't generally care for it's derivative-of-bing results, and has had some privacy oopsies lately that steer me away.
The way MS is moving, I really don’t want to keep using DDG if they are integral. I couldn’t really find much on the deal they made but DDG has done things for them that make me uneasy.
DuckDuckGo's results are a compilation of "over 400" sources according to itself, including Bing, Yahoo! Search BOSS, Wolfram Alpha, Yandex, and its own web crawler (the DuckDuckBot); but none from Google. It also uses data from crowdsourced sites such as Wikipedia, to populate knowledge panel boxes to the right of the search results.
A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing.
DDG operates a crawler just like that which is a characteristic of a search engine.
A search engine is defined by Webster as
computer software used to search data (such as text or a database) for specified information
also : a site on the World Wide Web that uses such software to locate key words in other sites
Which is what DDG is and does. How is DDG not a search engine?
DDG talks to all the search engines. It uses tons of them. Everyone except Google it looks like.
Before sending the query on your behalf, they simply anonymize it. Then return the results. DDG doesn’t actually perform a single search. So how can it be a search engine??
I know this is splitting hairs but I don’t get what many of you are struggling with. DDG just talks to existing engines on your behalf.
It does that, too, yes. But as I mentioned above it in fact does have its own web crawler and search algorithm, just like other search engines.
It combines the results which makes DDG technically a true search engine, even though it improves its results by utilizing other search enignes, too.
Shall we agree to this?