What markeitng departement do?

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What markeitng departement do?

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Simplistically, the marketing department makes people aware of the company and its products. In doing so, they are advertising the product. As a result, the marketing department will have some influence on how the product is sold. They are also likely to have some influence on how the product is developed.

Others
In a nutshell, the marketing department are the ones who look after the production of marketing materials (audio / visual) for the company they work for. This can be anything from catalogues through to tv ads, they're usually a creative group of people. They are also usually the ones who check major documents for spelling errors...
Try re-phrasing your question in grammatical English.