The difference between Client and Customer

When used as nouns, client means a customer, a buyer or receiver of goods or services, whereas customer means a patron.

check bellow for the other definitions of Client and Customer

Client as a noun:

A customer, a buyer or receiver of goods or services.
Client as a noun (computing):

The role of a computer application or system that requests and/or consumes the services provided by another having the role of server.
Client as a noun:

One who receives help or services from a professional such as a lawyer or accountant.
Client as a noun (legal):

A person who employs or retains an attorney to represent him or her in any legal matter, or one who merely divulges confidential matters to an attorney while pursuing professional assistance without subsequently retaining the attorney.

Customer as a noun:

A patron; one who purchases or receives a product or service from a business or merchant, or intends to do so.

Examples:

"Every person who passes by is a potential customer."
Customer as a noun (informal):

A person, especially one engaging in some sort of interaction with others.

Examples:

"a cool customer'', ''a tough customer'', ''an ugly customer"