Marketing collateral, in marketing and sales, is the collection of media used to support the sales of a product or service. These sales aids are intended to make the sales effort easier and more effective. The brand of the company usually presents itself by way of its collateral to enhance its brand.

The production of marketing collateral is important in any business' marketing communication plan.

Common examples include:

Sales brochures and other printed product information
Posters and signs
Visual aids used in sales presentations
Web content
Sales scripts
Demonstration scripts
Product data sheets
Product white papers
It differs from advertising in that it is used later in the sales cycle, usually when a prospective purchaser has been identified and sales staff are making contact with them.
http://en.wikipedia.org/wiki/Marketing_collateral