Helping out developers to get more eyes on their apps, Google is using its search engine to suggest apps to users. If you type something in search, they'll prompt you to install a certain app that can help fulfill the need or at least assist you with the search term. Once you install the app, you'll be redirected in the app to what you wanted to do on the web. For example, you're searching for a restaurant, Google might recommend OpenTable for you. Once installed, you'll be redirected to the reservation page of said restaurant. Developers can check out how they can be part of this implementation in the link below.