Please explain how a product can be used by both the consumer market and the business market.
Although some products are only good for one or the other of these markets, there are very many products that are good for both. That is because many products can be used either by end users or to create other goods or services.
Perhaps the most obvious example of such a product is a computer. Computers can be used by end users at home to play games or watch videos on YouTube. At the same time, the same kinds of computers can be used to keep medical records or other kinds of databases or to type correspondence.
Another obvious example is cars. Cars can be used by households to bring the kids to school or to extracurricular activities. However, they can also be used to deliver pizzas or as company cars allowing salespeople to make their rounds.