C2C (Consumer To Consumer)
Consumer-to-consumer (C2C) (or citizen-to-citizen) electronic commerce involves the electronically-facilitated transactions between consumers through some third party. A common example is the online auction, in which a consumer posts an item for sale and other consumers bid to purchase it; the third party generally charges a flat fee or commission. The sites are only intermediaries, just there to match consumers. They do not have to check quality of the products being offered.
Example of C2C
If you have cars and you want to sale it. You can promote your car by some online sites for selling and other citizen buys that car.