Can you explain the difference between progressive improvement and graceful degradation?

Progressive Enhancement starts with a basic, functional level accessible to all users and devices, then gradually adds more advanced features for browsers that support them. The focus is on accessibility and basic functionality.

Graceful Degradation begins with a full, multi-functional version of the application designed for the most advanced browsers. Then fallback options are provided for older or less capable browsers to keep the application operational, albeit with limited functionality. The focus is on full functionality for most users, ensuring basic operation for others.

Principle	Start	Approach	Focus
Progressive Enhancement	Basic functionality (HTML, CSS)	Gradual addition of enhancements (JS, CSS3, etc.)	Accessibility for all
Graceful Degradation	Full functionality (using latest APIs)	Providing fallback options for older browsers	Full functionality, ensuring operation on older browsers