Each of you dresses appropriately for the meeting, shakes hands firmly and maintains eye contact with interviewer, then answers the questions articulately. While a great resume and interview demeanor can help land an offer, the deciding factor often is the amount of energy or enthusiasm you project during the meeting.
Introverts often are uncomfortable about displaying enthusiasm.
Plus, if you've been unemployed for several months, you may not feel enthusiastic. Yet, even quiet candidates who don't normally show energy can demonstrate this quality to interviewers. Interviewing skills are learned, not innate, so you can teach yourself how to project confidence and enthusiasm during meetings with hiring managers. They only want you to provide to them during this 30 minute session that, if hired, you'll work tirelessly, achieve goals and connect well with others. Even if you don't have a naturally enthusiastic personality, you can verbally and visually relate how you'll attack assigned projects.