Is it possible for one application to work simultaneously in multiple processes?

Yes, an Android application can run in multiple processes simultaneously. By default, all components of the application run in a single process, but using the android:process attribute in the manifest, you can specify that a particular component (such as a service or activity) should be launched in a separate process.

This is useful for unloading the main process, isolating resources, or increasing stability. However, data in memory will not be shared between processes, so for data exchange, IPC mechanisms (such as Binder, Messenger, or ContentProvider) should be used.

Example in AndroidManifest.xml:

<service android:name=".MyService"
         android:process=":remote" />

Here, the MyService service will run in a separate process named :remote.