Your employer may not tell you exactly their own view of what being professional means. But we all know from experience how to get labelled as unprofessional. By finishing tasks or projects late, for instance. Being unprepared when attending meetings. Spending time gossiping at work.
Some of the important behaviors that are expected in the workplace are:

- Punctuality
- Attitude
- Presentation
- Organisation
- Reliability
- Time management
- Self Presentation
- Team Work
- Commitment
- Motivation

Punctuality
This means that it is important not to be late for your job or interviews, it is best to be early, roughly around 15 to 20 minutes. This is because it doesn't look good when you are late. There are no reasons why you should be late even if there is traffic on your way, it is still up to make sure you are early.
Attitude
It is important to keep a good attitude especially when being with customers, you don't want to set a bad reputation to your self and you don't want to get complaints of customers because your being miserablePresentation
You need to present your self good because everything comes down to how you present yourself. If you go to an interview in jeans and a t-shirt and not a smart suit the employer wont think twice of taking you on.