WHAT are the main functions of the marketing department?

Have you tried Google? I found a couple of websites that may help you : main functions of a marketing department - Google Search (http://www.google.com/search?hl=en&q=main+functions+of+a+marketing+department)

WHAT are the main functions of the marketing department??
Market department's works to promote their product in the market. So that market let to know about that products and try to buy that product with suitable benefits. Market department's always urge to get positive outcome from consumers.