A whitepaper is also called a prospectus. Any company or project that wants to sell its products must also have a whitepaper. The whitepaper will provide enough information to understand your ICO or coin project, such as goals, uses, benefits, development teams, operations, and problems. However, keep in mind that there are no rules in writing a whitepaper. Anyone can produce a prospectus. Neither is it called "whitepaper" but it is different from other marketing materials. So do not be overwhelmed by all the whitepaper that you read, the coin scam and the nonsense project also have a whitepaper.