After the phone closes the main interface of the software, the application of the software still runs and works in the background.

Moving to the background is actually to let the software run silently in the background. When you want to use it again, you can wake it up directly without opening it again, which can save traffic and improve response speed. Running in the background means not closing the current task, just not displaying it, but actually running it. Users of such applications only need to click the "Back button" twice in the application interface to exit, or click Exit in the application settings.