The term 'HOLIDAY SUB' can be summarized as a temporary substitute for holidays. This type of job is usually taken up by people who are looking for short-term work during the holiday season. It involves taking over the duties of another person who is away on vacation or leave. The job requires the individual to have the same qualifications and skills as the original employee, and they must be able to perform the same tasks. The job may also involve additional responsibilities such as covering for other employees who are away on holiday.