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"Strict" mode in Flutter is a mode that enforces certain rules and best practices to avoid common programming errors and improve code quality. This includes features such as:

1. Null safety: This ensures that variables cannot be null unless they are explicitly marked as nullable.

2. Type safety: This ensures that variables can only be assigned values of their correct type.

3. Linting rules: This enforces a set of best practices and coding style guidelines to improve code readability and maintainability.

4. No implicit casts: This prevents unexpected and potentially dangerous automatic type conversions.

Enabling "Strict" mode can help developers catch errors earlier, write better code, and avoid common pitfalls.