An employee who does not have a fixed or guaranteed schedule and works on an as-needed basis.
This type of worker is typically engaged on a temporary or irregular basis without a long-term commitment from the employer. Casual workers are often called in to work during peak periods or to fill in for permanent employees who are absent. They usually receive compensation only for the hours worked and may not be entitled to the same benefits or job security as full-time or permanent employees.
See also: 1099 Worker, Contractor, Freelancer, Gig Worker.