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Every Android app you've ever installed arrived as an APK. The Google Play Store downloads them, verifies them, and installs them silently — you never see the file. APK files become visible when you sideload (install apps from outside the Play Store), which Android allows but doesn't encourage.
An APK is technically just a renamed ZIP file. Open one with any archive tool and you'll find compiled Dalvik bytecode (classes.dex), resources, assets, a manifest file, and the app's signature. Google is pushing developers toward Android App Bundles (AAB), which let the Play Store generate optimised APKs for each device — smaller downloads, same app. But direct APK distribution remains common for beta testing, enterprise deployment, and apps that aren't on the Play Store.
Android installs APK files natively (Settings → Security → Unknown Sources must be enabled). On a computer, you can inspect APK contents with any ZIP tool. Sideloading APKs from unknown sources carries real risk — there's no Play Protect scanning, no automatic updates, and no guarantee the file hasn't been modified. Only install APKs from sources you trust explicitly.