Answer
C2C which is the abbreviated form of consumer to consumer is a model of the e-commerce. In this type of e-commerce one consumer can sell his product which may be new or used to another consumer located at any part of the globe. The payment mechanism in this system can be any electronics process using third party system.
Online auction is the best example of C2C. www.ebay.com is the example of online auction in which people can keep their product for auction. Any person who is interested to the product can purchase or bid the product. The site owner will be benefited in this system by charging commission to the seller.