关闭应用程序，清除内存为手机和平板电脑
- How to use it (for new users to do more)?
If you don't want to kill any app, you can tap it on the running applications list. Then it's checking box will turn to gray.
- Why there are app running that I haven't used or even opened?
Some app will start up once you turn on your phone or be invoked by some events.
- What is ignore list/ignore?