Many businesses have difficulties to bring their products on their market. Often their market it’s easy to be defined. On a defined market you can easy research your competitors and your customers, and what it’s very valuable, you can find details about every potential customer and you can bring him an offer.
A real example:
If your business does cleaning solutions for swimming pools you may be interested by all contact details (contact person, phone number, email address, website) of hotels who have swimming pools near you or even in entire country. If you have this data you can do direct marketing or email marketing (sending services or product offer by email)