Hakka is a kind of household registration in the ancient household registration system in China, which generally refers to non-indigenous households as opposed to the main household. It is not a unified class or stratum, including landlords, yeomen, urban vendors and unemployed people.

Customers or clients can refer to natural persons or organizations that accept property, services, products or ideas in exchange for money or something of value. Buyers of commercial services or products may be the final consumers, agents or middlemen in the supply chain.

Traditionally, customer and consumer are the same concept, and their meanings can be indistinguishable. But for enterprises, customers and consumers should be distinguished. Customers focus on specific market segments, and their needs are concentrated; Consumers are aimed at individuals, and their needs are scattered.

In marketing theory, suppliers must know the demand and supply of customers and their markets before selling, otherwise "hard selling" advertisements afterwards are just a waste of resources.

In modern society, "customer is God" is a popular slogan in business circles. In customer service, there is a saying that "the customer is always right". However, the parties have different interpretations, that is, different definitions of the word customer.

The word "customer" comes from the address habit. A customer is a person who frequents a store or main account. He frequents or buys things, and keeps good relations with shopkeepers or major customers.

Above content reference: Baidu Encyclopedia-Customers