Summarize what you have done that qualifies you for this opportunity. Don't recite what is on your resume or job application, but don't assume that the interviewers, who may have been interviewing several candidates, will remember all of your qualifications.
Start with your current/most recent job, and present the most significant highlights, the ones that would be most relevant to this job. These are the qualifications that make it clear that you are a very good candidate for the job.
Add other relevant details and accomplishments that demonstrate you are qualified for this position.