There is an art in being able to explain yourself. Telling your story in a way that makes it compelling to an employer or interviewer is a skill to be mastered. Explaining your personal contribution and relevance to others doesn't necessarily involve comprising your background and content but it does involve some self-awareness and delivery.
How can you effectively talk and communicate your way through an interview process? Melissa Marshall has some great tips… gone are the days of death by PowerPoint.