Primary research involves collecting original data through methods like interviews, observations, and questionnaires. It allows researchers to aim questions directly at their research objectives. Secondary research uses existing information found in sources like books, newspapers, journals, and online. While easier than primary research, secondary research risks using unreliable or outdated information. Market research studies existing products to identify strengths and weaknesses that can help improve a new product. It also helps determine the best ways to advertise to a target audience. Viability research assesses whether a product is worthwhile to create by analyzing factors like production costs, profit potential, and whether the product fills a need in the market.