Apps exist for almost any conceivable human function, from entertainment to communication.
There’s a reason why the saying “there’s an app for that” came about. Some believe that eventually, the reliance on apps will become so prevalent that businesses will almost have to invest in an app. Now that search engines can crawl, index, and even stream content from apps, there’s even concern that traditional websites will play less of a role in the future – possibly disappearing completely.
Although it’s unlikely that websites will die out altogether, there will definitely be more changes coming in regards to how search engines will interact with apps, as there are more mobile users than PC users today. For more on mobile versus desktop users, you should read this article: http://www.designer-daily.com/analyzing-mobile-vs-desktop-user-behavior-29380
Google has already offered a means of indexing apps.
With a few simple development protocols, you can get your app listed in search engines for relevant user queries (on mobile devices).
With the exploding popularity of apps, it’s difficult to predict just how far they will take us. And, with new technology still traveling at full force, even apps may eventually get replaced with something else. But for now, they’re here to stay, so use them to your benefit.