Collaborative commerce (C-commerce) is the use of digital technologies by different business parties for sourcing products, making transactions or completing similar interactive business processes. It is a subcategory of e-commerce.
Techopedia explains Collaborative Commerce (C-Commerce)
Collaborative commerce is a business-to-business (B2B) transaction involving a trading community or a segment of an industry. To allow collaboration between the business parties, the buyers and sellers use compatible software tools in their distribution and supply chain. Hence, C-commerce is sometimes viewed as an aspect of supply chain management.