The main reason that it is important for a business to have a website is how people are likely to find you. These days most people will go online and research products and companies before they make a purchase, if you don’t have a website you are missing out on all of this potential business. Even if people don’t buy your product online they are still likely to research it online so you have to have a website so these people can learn about your business.
A website is also important because it helps you establish credibility as a business. There are still quite a few small businesses that don’t have a website and without one they are unable to grow as quickly as a business that has one. If you don’t have a website that you can refer people to potential customers are going to assume that you are a small time company that does not take their business seriously.