An interview is a two-way street. You can gain insight on the position and evaluate the organization to which you have applied. Simultaneously, the employer has a chance to describe the open position and to evaluate your abilities in light of that job description. It is a chance for both parties to get to know each other and to determine if there is potential for a match. Anyone can learn to interview effectively.
Most people find interviewing to be a daunting prospect.
Just remember, the key to a successful interview is preparation and careful listening. Interviewing is a skill, not an art.