This is what is known as causation. Many events appear to be the results brought about by identifiable causes, and the human mind is geared to look for these cause/effect relationships. We get into trouble when the mind seeks or creates an artificial cause/effect relationship that doesn't actually exist.
Copy means written words or text of any kind in various genres. Ad copy means text written specifically to sell something. Body copy refers to text that is in the middle or main part of a piece of writing. Sometimes it's easier to define something by what it isn't.
Copy is defined as text within a publication or composition. This is in contrast to graphic or pictorial aspects of a publication, article or other kind of composition. Ad copy is text that is used for selling, as opposed to text used for any other purpose, such as informing or entertaining.