Difference between the main thread and UI thread

Question

I\'m given to understand that both are the same. But I recently(a bit late to the party) came across android support annotations . The note in the same reads

Answer 1

In Android, the "main" application thread is sometimes called the UI thread.

Quote from official API about the Main Thread:

[...] the thread in which your application interacts with components from the Android UI toolkit (components from the android.widget and android.view packages). As such, the main thread is also sometimes called the UI thread.

Official API found here.