Cliens the Latin, the term client allows to refer to the person who has access to a product or service for a fee. Customer is a person or organization that receives a product The notion tends to be associated with those who use the product or service concerned with attendance, although there are also occasional customers (or off).

Depending on the context, the word client can be used as a synonym for buyer (the person who buys the product), user (the person who uses the service) or consumers (who consumes a product or service).