Earlier this year, Google announced two major pieces of news with regards to how it ranks search results on mobile devices. The one that got the majority of industry coverage was related to the mobile-friendliness of sites. The other was that Google started using app indexing as a ranking signal, and has even expanded that signal since the initial announcement.
This week, Google hosted an hour-long "office-hours hangout" (via Search Engine Roundtable) on the topic answering numerous questions about the topic, so if this is something you want to take advantage of (and if you have an app, why wouldn't you?), you'll probably want to give it a watch.
App indexing and related efforts from Google should mean increased discovery for new and existing apps and the content within them. Etsy sellers appear to already be benefiting.
You might also want to take a look at this App Indexing talk from Google I/O.
Image via Google