B2B（business to business）是商业用语，也就是企业与企业间的电子商务模式。

舉例：汽車配件制造商直接賣汽車配件給汽車制造場，他們之間的關系就是B2B。

Business to Business - B2B Business conducted between companies, rather than between a company and individual consumers. 而b2c（business to customer)是指企業對消費者的電子商務模式，也就是電子零售業務。

舉例：Wal-Mart就是B2C的公司。

Business to Consumer - B to C Business conducted between companies and individual consumers, rather than between two companies. 當然還有C2C,Consumer-to-consumer; describes transactions in which a consumer sells a service or product directly to another consumer C2B ：Consumer to business C2b is a business model where the consumer creates the products for a company that they will also buy. B2B2C Business-to-business-to-consumer; describes transactions in which a business sells a service or product to a consumer using another business as an intermediary. 其實這些都屬於電子商務的分類，你如果感興趣的話，可疑看一些這些方面的書籍。

E--COMMERCE.(電子商務）。