TypeScript is a superset of JavaScript that adds static typing and other features. Angular uses TypeScript because:

• Type Safety: Catches errors at compile time rather than runtime
• Better IDE Support: Enhanced autocomplete, refactoring, and navigation
• Object-Oriented Programming: Supports classes, interfaces, and inheritance
• Modern JavaScript Features: Supports ES6+ features while maintaining backward compatibility
• Better Maintainability: Makes large codebases easier to manage
• Enhanced Debugging: Better error messages and debugging experience