Got asked this today in an Android interview. I answered the usual, you know, intent + startActivity, etc. Interviewer then asked more pointedly,
\"Ye
As long as you are not in an interview for an Android system developer (kernel hacker, ...) the answer is simply: That is an implementation detail of the Android framework a normal Android developer should not need to care about because of the abstraction and layer principle and it can be looked up in the rare case you would really need to know it.