A job is a regular activity performed in exchange for payment, usually as one's occupation. A person usually begins a job by becoming an employee, volunteering, or starting a business, profession or vocation. The duration of a job may range from an hour (in the case of odd jobs) to a lifetime (in the case of some judges). If a person is trained for a certain type of job, they may have a profession. The series of jobs a person holds in their life is their career.