What B2B (Business-to-Business) is

An acronym that describes business-to-business relationships or applications. Many Web sites focus on B2B solutions that cater to a vertical market, such as healthcare or automotive. These sites are for businesses (think wholesale), and only other businesses can access them or make purchases. Similarly, a B2B auction is used to liquidate unwanted capital assets, dispose of excess inventory, and buy or sell equipment, parts, other products, and services. One advantage of setting up a B2B Web site is the ability to streamline operations between two businesses that already have a relationship. Internet analysts predict that B2B will be the biggest sector on the Web. NetLingo.com has a B2B component that includes the ability to license online content, such as the NetLingo Pocket Dictionary or the NetLingo Search Portal, to other companies, or to customize this book, NetLingo: The Internet Dictionary, for a company's promotional purposes.

The meaning of Legacy business

Slang for a traditional brick-and-mortar firm. Accurate or not, anything characterized as "legacy" is perceived to be old or outdated (as opposed to a new economy company, for example).