Directory sites are websites that provide lists of businesses to help people find the products or services they need. For example, if someone is looking for a pest control company in their area, a directory would list several options and contact information. Sometimes, these listing sites are limited to a specific industry. Other times, they can help you find a wide variety of companies. So, in the above example, you might use a directory site specifically for pest control, or you might use a more general one.