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The current status of something
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The success or failure of an important task or action
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A warning about an action that can have negative consequences
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An opportunity to correct a mistake or problematic situation
Best practices
Make sure all feedback is accessible.
Consider integrating status feedback into your interface.
Use alerts to deliver critical — and ideally actionable — information.
Warn people when they initiate a task that can cause data loss that’s unexpected and irreversible.
When it makes sense, confirm that a significant action or task has completed.
Show people when a command can’t be carried out and help them understand why.
Platform considerations
watchOS
Avoid displaying an indeterminate progress indicator — such as a loading indicator — in a watchOS app.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/feedback