share focus status very popular features in iphone 

"Share Focus Status" is a feature who allows applications to detect that What is the status of Focus mode.

The “Share Focus Mode” option should be  enabled, then only apps will be able to see that .otherwise they don't see your Focus status.

Focus can help prevent distractions by grouping notifications.

you have option to share your Focus status on a contact-by-contact basis.

To access this setting, open a conversation with a contact and tap on their name at the top of the screen. Scroll down until you see the “Share Focus Status” toggle and enable or disable it.