Usually, this is done via APK files. APK files are Android installer packages downloaded from the internet, and they're often provided by third parties like websites dedicated to hosting the files.

Kakinada district superintendent of police G. Bindu Madhav has launched a campaign against fake and harmful apps. She has asked police officials to educate people about the adverse impact of APK ...

The feature does indeed stop potentially harmful .apk files from automatically installing onto ordinary Samsung-branded mobile devices.

The source of the leak has access to the APK files for all One UI 7 apps. He asserts that he has uploaded all the One UI 7 apps to APK Mirror, yet most of them are still awaiting approval.