"C2C" stands for Consumer-to-Consumer, a model in online marketplaces where individuals buy and sell goods or services directly to each other. This business model is enabled by platforms like eBay, Etsy, and Craigslist, allowing users to connect and conduct transactions without intermediaries. C2C marketplaces empower users to monetize their goods, encourage sustainability through second-hand selling, and foster community engagement. This approach has gained popularity due to the rise of e-commerce and shifts in consumer behavior toward peer-to-peer interactions.