Android APKs: packages, versions and compatibility.
An APK is a file format used to package an Android application. The extension tells you the package type, not whether the publisher is trustworthy or the app is compatible with your phone.
What is an APK?
An APK is an Android application package. It contains the application components Android needs to install and run the app, but the file extension does not tell you who built the package or whether it has been altered.
Two APKs can use the same app name while coming from different sources, versions or package builds. That is why package provenance matters when researching third-party software.
Compatibility checklist
Why version numbers need context
A version number can help identify what a page is discussing, but it is not automatically proof that a package is current, official or safe. Record the exact version, publication date, package source and device requirements together.
Common installation problems
Parse error
The package may be incomplete, incompatible with the device or built for a different Android environment.
App not installed
Possible causes include package conflicts, insufficient space, signing differences or unsupported architecture.
Unexpected permissions
Stop and review why the package requests access. A feature list should not override a privacy check.