What are creepage and clearance?

This video from the TI Precision Labs - Isolation series will provide a brief explanation of isolation creepage and clearance. The video will answer the following questions:

1. What are creepage and clearance, and how are they different?
2. How is minimum creepage and clearance determined for a system?
3. What is working voltage and why does it matter for creepage and clearance?
4. How does the operating environment affect creepage and clearance requirements?