Appearance is how someone looks. You should wear neat and clean clothing, have a good personal hygiene. You should also have a polite behavior toward others. A smile is very important part of your apperance when meeting others or interviewing for a job. Employers look for all of this during interviews.
A person who is groomed and neat in has a good appearance. Cleaned and combed hair that is styled appropriately for the job or class is an example of good apperance. Apperance is a very important part of work ethic because the first impression is the most important one. You can never get a second chance at first apperance.