B2C stands for business to consumer, which refers to the retail model where products move directly from the business to the end user who has purchased the goods or services for personal use. It is a digital sales model where products and services are sold between a company and a consumer without any third-party, retailer, or middleman.
Nowadays, almost all businesses are working on the B2C model and are in direct connection with their customers.
Example
Amazon and Walmart deal with the B2C model where individual customers make a purchase from the website. A common Instagram user who would place an order to a business directly via the inbox will coordinate with the business frontman directly, and that makes it a B2C model.

Simplify Your Social Media Strategy.
With Social Champ, effortlessly apply the best practices you’ve just learned. Schedule posts, analyze performance, and engage with your audience—all in one place.