The document outlines the concept of 'app constellations,' which refers to mobile apps that share a single login and incorporate app-to-app linking, excluding gaming apps. It provides data on the growth and number of apps in major companies like Facebook, Google, and Tencent from 2014 to 2018, highlighting the trends in the Apple iTunes app store. Additionally, it includes links to the author's profiles and a thank you note in multiple languages.