A side job, also informally called a side hustle, is an extra job that a person takes in addition to their primary job in order to supplement their income or simply to turn their hobby into a micro-business. Side jobs may be done out of necessity when a person's main job does not provide sufficient income to support them, or simply out of a desire to earn more money or to try something interesting. Working a side job is also referred to as moonlighting, usually when it is performed after regular business hours. A side job can be a full-time job, part-time contract, or freelance work, and a person can hold more than one side job.