The Internet is one of the most excellent and cost effective forms of advertising available for your small business. If you competitors have a website and you do not, you might be losing potential customers and money.
Your website does not have to sell your products, it can be used simply to let people know you are there and promote your company.
Consumers have more confidence in and prefer doing business with companies that they know something about. For small businesses particularly those that rely on a local customer base this can be an invaluable source of additional customer inquiries.
If you are an individual, your personal website can be an excellent way to promote your ideas or hobbies, and you can create a real community of people with the same ideas, hobbies, and beliefs as yourself.