Clarification: Every smartphone can long-press and search the default search engine, which is usually Google, but some people change it to DuckDuckGo or something else for privacy reasons. Either way, it'll tell you who a famous person is.

Every computer/web browser can highlight, right click, search the Internet for the highlighted thing. You don't need special software to do it.

(Not disagreeing, just clarifying for anyone who doesn't know how. Though, I suppose they do know, they just feel entitled to have someone explain it to them personally.)