Have you enjoyed visiting a great website design for any other business or a restaurant visit? If you liked it you must have also shared the name of the place or the website name with family & friends. This is because of the website effect that it created on you while you were going through.
A website design paired with navigation as an intuitive site offers the end user a great experience. This word of mouth leads to more potential clients and traffic. The same is for your website as well. Once it gets attracted, the word of mouth brings more traffic.