customer
[C] Countable
pl: customers
This term defines a commercial relationship based on a transaction. It carries a neutral, professional tone and focuses on the act of purchasing. It is the standard term for anyone paying for a product, regardless of whether they are a one-time buyer or a lifelong patron. It differs from a client, which usually implies a professional service relationship involving ongoing advice or specialized expertise, such as with a lawyer or an accountant. While a customer buys a thing, a client buys a professional relationship.
Used to count individual people or entities who make purchases at a business.