Final answer:
The core mission of Zappos.com is to provide the best customer service, which has been fundamental to its success and shapes the company's culture.
Step-by-step explanation:
The core mission at Zappos.com is to provide the best customer service possible. This commitment to customer satisfaction is known as "Delivering Happiness," a term that is also the title of a book written by Zappos CEO Tony Hsieh. Zappos's emphasis on customer service includes providing a wide selection of products, a user-friendly website, free shipping both ways, a 365-day return policy, and a call center that is open around the clock. This approach has been integral to the company's success and is the foundation of their company culture.