When employers are reviewing resumes and calling candidates they want to meet, they are trying to figure out one thing: Who is the best person for this job? They are looking for someone who fits the bill and brings the whole package. Figure out what you bring to the table, and during an interview know how to explicitly convey why you are the best person for the job.
Succinctly cover all the bases, from fitting in with the company's culture to how your previous experience gives you an edge in the position you're going after. This is your chance to sell yourself to the employer, so make it short, sweet, powerful, and complete.