If you entered a question into Google recently, you may have noticed the informational box at the top of the page that displays a quick answer to your question.
Google Rich Answer Box is a short snippet of relevant content that a user can quickly read without having to scroll through a lengthy article. This is introduced in order to give users a perfect answer to their search query in a short time.
A “Google's Rich Answer” is any attempt by Google to answer the searcher’s query in search results in a way not requiring a click through to a website.