A job interview is a two-way process. For the employer, it is the opportunity to discuss your application, your ability to meet the role's requirements, what motivates you and whether you will fit in with the team and organisation as a whole.
For you, it is the opportunity to convince the employer of your potential by expanding on the information in your application. You can also use this opportunity to find out more about the job and the company and decide whether or not it fits with your career plans.
The following resources can assist your interview preparation.