Marketing:

The process by which a sender of information convinces an entity (almost always other than itself) to willingly become a receiver of information such that the information can be of any type, in any form or at any scale, and in such a manner that there is at least a potential to at least potentially benefit either the sender (most often) and/or the receiver and/or another entity.

Sales VS Marketing

Sales is done in person or such does it may seem

Marketing is usually via text and/or via audio/video and is often (not always) less personalized and/or with a larger reach.

A salesman who propagates via the written word and/or audio and/or video or other forms of selling where his realtime presence (in any form) isn’t required, is a marketer.