What role can Android phone long press the home button play?

Android phone long press the home button can play the following roles:

Home button can be said to be one of the most commonly used functions in our daily life. Generally, we use this button to return to the home page or bring up the voice assistant and so on.

Every version of Android, often press the home button, and the recently used app icon will appear on the screen.

For Android 4. 1, it is more detailed, that is, not only the recently used aop will appear, but also the programs running in the background, and a simple small window can quickly switch to the background programs.

The simple understanding is that the home key of a mobile phone is the menu key and the primary key.