attendance is important in a job because it shows how dedicated you are to your profession. it means you take your job seriously, and want your boss to notice it, to potentially get a promotion. example of poor attendance: skipping work to get your nails done, this is very immature, as people are counting on you to do your job when you have a shift. not only the customers, but your boss and coworkers as well. if one person is missing the whole ship sinks.
hope this helps!