What is the difference between marketing, advertising, and propaganda?

I believe marketing, advertising, and propaganda are all similar in meaning and in what they are trying to accomplish. Their overall goal is to promote something to a certain audience and persuade them to feel a certain way. To me marketing is more business related, for example finding the right audience to show a product to. Advertising seems more like a general appeal to anyone in public, such as a billboard. Finally,  propaganda seems to be more political, for example during a presidential election a candidate may use commercials to emphasize why they should be voted for.