A casual employee is someone who is recruited on an irregular or as-needed basis, with no expectation of future or guaranteed labor. Casual employees, unlike full-time or part-time employees, do not have a set schedule and are often hired on a temporary basis to satisfy short-term workforce requirements.
Example
To deal with increased consumer traffic during the hectic Christmas season, a retail business recruits casual staff. These personnel work irregularly, typically stepping in for regular staff members on vacation or during peak shopping hours. They are not promised a specific amount of hours each week and can accept or refuse shifts based on their availability. The shop gives them an hourly salary and does not provide perks such as paid time off or health insurance. When the hectic season ends, their employment may be temporarily halted until the following peak demand period.