in the trade lexicon, a customer is someone who buys a good or a service, as opposed to the seller who has a product to sale.
Both the customer and the seller are economic agents. The customer is also known as the purchaser or the buyer or the client.
The seller is known as the supplier.

Our economy revolves around these 2 inseparable dynamics.
Indeed, the market system is fairly simple in a way: everybody has some needs; and goods and services are produced in a large scale to fulfill them.
Prices and the production for these products are the result from the meeting of a demand and a supply. The demand in a specific market, is the sum of all the potential customers interested in buying a product, and the supply is the sum of all the suppliers who offer to sale it!

There's a sort of competition between suppliers who peacefully fight to cover a specific segment of a market. A seller is therefore constrained to stand out from the others by any means.
To “win” the market competition, he needs to offer his customers things that they would never get elsewhere.

Therefore, THE motto of businessmen is this following statement: The customer is King!
Everybody has already played the part of a customer. And everyone can tell how retailers in some shops, stores, companies, banks...stick sometimes a bit excessively to the word:
Customers are warmly welcomed everywhere they go, because their purchasing power stands for a potential revenue for the businessmen.

In restaurants, shops... managers often tell their sellers to pamper the customers and to give them the royal treatment.
That's why sometimes sellers pounce on you like a prey. They are like these starving or greedy cartoon characters whose eyes turn into a roast-beef when they see a nice cow, or into dollar signs when they see a perfect Candide candidate to fleece.

At TomsGames.com, you're nobody's customer: all games are free! But you can play a shop keeper or a restaurant waiter who needs to treat very kindly his customers...