When you see per diem in a job listing, it usually refers to a type of pay arrangement where you're paid by the day, rather than by the hour or a fixed salary. This means you'll get a set amount of money for each day you work, regardless of the number of hours you put in. Per diem jobs are often used for temporary or on-call positions, where the employer doesn't know exactly how many hours they'll need you to work. It's different from a regular full-time or part-time job, where you'd typically get a steady paycheck based on a set schedule, and it can be a good option if you want flexibility or are looking to supplement your income.