DuckDuckGo’s premise is simple. They do not collect or share personal information. They log searches, but they promise that these logs are not linked to personally identifiable information. Their search engine results seemingly come from Bing, but they claim to have their own crawler and hundreds of other sources on top of that. They do customize the results a little: geo-searches like bars near my location give me results from my home city of New York. But search results aren’t personalized. I’ve always wondered how good the results would be.
DuckDuckGo is my default, main search engine on all my computers and devices. Every now and then I do use the g command to tell DDG to do a Google search, but overall, I’m incredibly satisfied with how DDG performs.