Focus is a feature on iPhone that helps reduce distractions and set boundaries. When you want to concentrate on a specific activity, you can customize one of the provided Focus options or create a custom Focus. When you set up a Focus, the icon appears in the status bar and on your Lock Screen, and your status is automatically displayed in the Messages app. When people try to send you a message, theyll see that youve silenced notifications, but they can still notify you if its urgent.

The "Share Focus Status" feature allows applications to detect that a Focus mode is enabled and share your Focus status with select contacts when they try to reach you. When you share your status in a particular mode, contacts that try and message or call you using apps like Messages will see a "<Name> has notifications silenced" with an option to "Notify Anyway" if the contact deems the message important enough.

To turn on Focus, you can open Control Center on your iPhone, swipe down from the top-right corner of your screen, and tap the Focus icon. You can also go to Settings > Focus, then tap a Focus—for example, Do Not Disturb, Personal, Sleep, or Work. You can specify which apps and people can send you notifications during your Focus and customize the options for your Focus.

In summary, Focus is a feature on iPhone that helps reduce distractions and set boundaries. The "Share Focus Status" feature allows applications to detect that a Focus mode is enabled and share your Focus status with select contacts when they try to reach you. You can turn on Focus by opening Control Center or going to Settings > Focus, then customize the options for your Focus.