What is DuckDuckGo?
“DuckDuckGo is a general purpose search engine that is intended to be your starting place when searching the Internet. Use it to get way more instant answers, way less spam and real privacy, which we believe adds up to a much better overall search experience.”
From their privacy page:
“!bangs” are special commands that give users the ability to search 100s of other sites directly from the DuckDuckGo search box (including other search engines). There are currently over a thousand !bang commands available. The most popular “!bangs” are also available in the drop down menu.