Copy Editing vs Proofreading?

What’s the difference between copy editing and proofreading? Editors Canada, the national editors’ association of which I’m a member, explains what copy editing and proofreading entail. They also define the other kinds of editing that editors do, such as developmental and stylistic editing. The definitions are part of the associations’ publication Professional Editorial Standards. The explanations are clear, easy to understand, and are there whenever a client needs them.