what’s the difference between Expires and Cache-Control headers?

Question

What’s the difference between Expires and Cache-Control headers?

Answer 1

Heroku devcenter has an excellent article on this subject.

Quoting from it,

While the Cache-Control header turns on client-side caching and sets the max-age of a resource, the Expires header is used to specify a specific point in time the resource is no longer valid.