What is B2B and B2C in salesforce?

B2B: (Business to Business) It is used to the selling of products/services from one business to another. B2B sales relationships have a longer lifespan, as the processes involved in closing a sale are lengthier.
B2C: (Business to Customer) It is used to the selling of products to an individual customer. The B2C sales cycle is shorter, as the customer is encouraged to purchase the product on the spot.