APK (Android app package)
Also known as: apk file, android package, install apk
An APK is the package format Android uses to distribute and install apps. It is a ZIP archive that bundles the app’s compiled code, resources, and a manifest. Leftover APK installers in your Downloads folder are safe to delete once the app is installed.
- ZIP-based package that installs an Android app
- Contains DEX code, resources, and a manifest
- Downloaded installers are safe to delete after install
What is inside an APK
APK stands for Android Package. Under the hood it is a ZIP container holding the app’s compiled DEX bytecode, native libraries, images and other resources, and an AndroidManifest that declares permissions and components. Renaming an APK to .zip and opening it shows the same structure.
You install an app by handing the APK to the system installer, whether it comes from the Play Store or is sideloaded. Sideloading requires allowing installs from the source app under Settings > Apps > Special access > Install unknown apps.
Do downloaded APKs waste space?
Yes. After an app is installed, the original APK file you downloaded is just a copy sitting in Downloads — the installed app no longer needs it. These leftover installers can quietly add up, so clearing them is safe storage cleanup.
Modern apps are increasingly shipped as AAB bundles that the Play Store splits into device-specific APKs, so a single download only contains the code your phone actually needs.