People search the internet for businesses, products, services, etc. The days of relying on phone books are long gone. If someone needs to find information, they are most likely turning to the internet to find it. When they search for something you offer or specifically for your business, So you want to show up- and not just show up- but show up and look good.
Looking good is important because your website is often your first impression you give potential customers. If they found you through a search or through a link a friend gave them, your website will be your first point of contact with them. Before they even see your store or talk to your staff, they will see your website. You want that first impression to be a good one.