All 7 Accessibility in Flutter Apps questions
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What is the Semantics widget in Flutter, and how does it help screen readers correctly describe the content and purpose of a widget to a visually impaired user?

Beginner

Answer

The Semantics widget lets you attach additional descriptive information to a part of your widget tree, such as a readable label, a hint describing what will happen when the widget is activated, or a value representing its current state, and screen reader software such as TalkBack on Android or VoiceOver on iOS reads this semantic information aloud to a visually impaired user, letting them understand and interact with a widget even though they cannot actually see it on the screen.
Semantics(
  label: 'Increase quantity',
  child: IconButton(icon: Icon(Icons.add), onPressed: incrementQuantity),
)
Real-world example A shopping cart screen wraps its plus and minus quantity icon buttons in Semantics widgets with clear labels, ensuring a screen reader announces exactly what each button does instead of just saying icon button.

Common follow-ups: Do all Flutter widgets already include reasonable default semantic information automatically?;What is the difference between a semantic label and a semantic hint?

Flutter Widgets Fundamentals (Stateless & Stateful);Custom Widgets & Reusable Components
All 7 Accessibility in Flutter Apps questions