What does Apple Focus Mode mean?

Apple's focus mode is an upgraded version of do not disturb mode. Simply put, it is to let everyone put down their mobile phones and concentrate more on their work and study. When you set the focus mode, you can choose which contacts and application notifications to add to the Allowed Notifications. You can also enable "Timely Notification" from applications, which will allow those applications that are not in the allowed list to send notifications marked as "Timely". After setting the focus mode, the status bar and lock screen will display corresponding icons, and the set status will be automatically displayed in Info App. When someone tries to send a message, the other party will see that the host has muted the notification, but if the situation is urgent, the other party can still notify the host. When I use focus mode on a device, the corresponding settings will be automatically applied to all Apple devices that I log in with the same AppleID.