1. Android system

Android was born of the desire of a group of 47 companies within the Open Handset Alliance to offer a free, open and complete mobile platform. Android enables new applications to be built using data from the web as well as personal data, such as geolocation, contacts, calendar...

The Android system is a multi-user Linux system. Each application is considered a different user with its own ID. The Android system operates on the principle of least privilege, i.e. each application has access only to the components required for its execution.

Each application runs in its own virtual machine (VM), isolated from other applications. This ensures that, by default, different applications cannot share data and resources. Where such sharing is necessary, the required permissions must be explicitly and statically specified.