A freelancer is a person who offers his services for a certain amount of fee. It is not necessary that they do so for a single client only but depending upon the working relationship the work can be ongoing. It is believed to be a form of self-employment. They are usually given a particular project by a client who after completion of the project promises to pay a certain amount to the freelancer for his services. This payment is made in the form of an invoice which declares that the following individual has been given a certain amount of money for offering his services as a freelancer.