Building on my “Context and Manifest talk” primer, this session dives straight into Android’s guts. When you tap an app icon, a simple call to startActivity() travels through Binder IPC, wakes the Zygote process to make a new copy of your app, and creates fresh Context objects—all in just a few milliseconds, before the splash screen even appears. You will see how ApplicationContext is born from that pre‑warmed Zygote copy, how ActivityContext applies themes and how a mistake can cause memory leaks, and why ReceiverRestrictedContext is a strict and limited Context that often says “no.” We will find the exact moment a Context reference starts leaking memory, learn how ActivityManagerService decides which processes stay alive or are killed, and finish with five clear rules for building faster, safer apps.