What is is a free Chrome add-on developed by NewerMind that allows users to quickly search for the definition of selected or submitted text using the "Define" operator in Google. This add-on is categorized under Browsers and falls under the subcategory of Add-ons & Tools.

With What is, users can initiate a search in two ways. Firstly, by clicking the shortcut icon or the context menu item when they have selected a specific text on a web page. Secondly, by submitting a text directly from the browser action popup form. However, it is important to note that the search text is limited to a maximum of 10 words.

Upon triggering a search, the extension opens a popup displaying the Google search result page. The foremost result shown is the definition of the searched text, as indicated by the "Define" search operator.

What is offers a convenient and efficient way for Chrome users to quickly access definitions of words or phrases without having to leave their current web page. It is a handy tool for those who frequently need to look up definitions while browsing the internet.