Much of this book focused on making apps as indispensible as possible. You’ve seen how to make powerful apps that tie in with the operating system at a low level and display as options throughout the phone. Apps can become fully indispensible by adding
, which allows them to automatically present themselves to the user when something interesting happens. Push technology proactively does something useful to benefit the user, rather than passively waiting for them to initiate an action. In other words, rather than wait for the user to open your app, you tell them what they need to know now.