Many B2B sites may seem to fall into more than one of these groups. Models for B2B sites are still evolving. Another
type of B2B enterprise is
software for
building B2B Web sites, including site building tools and templates, database, and methodologies as well as transaction software. B2B is e-commerce between businesses. An earlier and much more limited kind of online B2B prior to the Internet was Electronic Data Interchange (EDI), which is still widely used. Over the next five years, B2B is expected to have a compound annual growth of 41%. The Gartner Group estimates B2B revenue worldwide to be $7.29 trillion dollars by 2004. In early 2000, the volume of investment in B2B by venture capitalists was reported to be accelerating sharply although profitable B2B sites were not yet easy to find.