Blue collar usually refers to a manual worker.

Most are white collar (those that work in office buildings and do not get their hands dirty at work).

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A new-collar worker is defined as a middle-class person that works in the service industry. They are placed between a blue-collar and white-collar worker.

White-collar worker is a salaried professional or an educated worker who performs semiprofessional office, administrative, and sales coordination tasks as an opposed to a blue-collar worker,whose job requires manual labor and receives an hourly rate of pay rather than an annual salary.