One thing that Google has continued to work on since the launch of the then-Android-Market is app discovery. Even with thousands of great apps ready for you to download and install, they do no good if users just aren’t finding them.
In the past we've seen Google introduce curated recommendations from staff, but it started making things personal last month with a "Recommended for You" section in the web-based Play Store. Now, that feature is finally coming to the Play Store app, as well.
It takes into account factors like which apps your Google+ friends enjoy and the general geographical area in which you live -- these thing play a role in influencing just which apps Google recommends. Below each, the Store will give you a brief explanation of why it thinks the app might be pertinent to your interests.
When Google just totally misses the mark on its suggestions, you can tap an "Uninterested" icon to let the company know, training it to provide more on-target recommendations in the future.