What is the difference between chili powder and cayenne pepper in terms of flavor and heat level?

Chili powder is a blend of various spices, including cayenne pepper, while cayenne pepper is a single spice made from dried and ground cayenne peppers. Chili powder tends to have a milder heat level and a more complex flavor profile due to the additional spices, while cayenne pepper is hotter and has a more straightforward, intense heat.