The interviewer wants to know how your skills, knowledge and experience match the needs of the position. Practicing what you're going to say and how you’re going to say it will help you communicate clearly and confidently.
Most people feel anxious about a job interview. You can choose to be positive and confident, even if you’re nervous. Pretending to feel confident, will have a positive effect on both you and the interviewer.
How you present yourself in the interview—your appearance, your attitude, your body language—is vitally important. You don’t get a second chance to create a first impression!