Directory Sites are sites that comprise searchable listings of one sort or another, enabling a community of industry participants and/or consumers to interact with the directory site to one degree or another.
Here are some examples:
Illinois Methodist Church Directory might contain searchable church listings for a given geographic ares, a calendar of events, interactive map functionality, and the ability for subscribing churches to manage their church respective listing and events.
International HVAC OEM Directory might list all outlet stores that carry and service their products. Retail managers might have the ability to update their store listings, manage their consumer lists, offer location-specific sales & marketing promos, opt in to regional and national promotions, and access corporate’s marketing calendar. Check out TraneRewards.com
Milwaukee Nightlife Directory might list all known bars in the Metro-Milwaukee area, include hours of operation, descriptions of bars, directions to bars, bar specialties, and allow consumers to rate and write reviews for said bars.