Promotion:
Promotion keeps the product in the minds of the customer and helps stimulate demand for the product. Promotion involves ongoing advertising and publicity .The ongoing activities of advertising, sales and public relations are often considered aspects of promotions.

Marketing:
Marketing is the wide range of activities involved in making sure that you're continuing to meet the needs of your customers and getting value in return. Marketing is usually focused on one product or service. Thus, a marketing plan for one product might be very different than that for another product. Marketing activities include "inbound marketing," such as market research to find out. for example, what groups of potential customers exist, what their needs are, which of those needs you can meet, how you should meet them, etc.

Publicity:
Publicity is mention in the media. Organizations usually have little control over the message in the media, at least, not as they do in advertising. Regarding publicity, reporters and writers decide what will be said.

Sales:
Sales involves most or many of the following activities, including cultivating prospective buyers or leads in a market segment, conveying the features, advantages and benefits of a product or service to the lead, and closing the sale.

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Then let these shivers go on fire...
And these screams go blind...
And you go sore in the eyes your life is an abyss...
Where your shadow reached before You.