Impress the employer by researching the company or organization before you apply and/or interview. Information will help you create more effective resumes and cover letters for that employer. Researching the organization will help you be prepared to answer questions at the interview and will help you develop questions to ask them.
Tip: Many organizations (companies, govt agencies, nonprofits, schools, etc) prepare an Annual Report, which might be found on their web site. For public companies, look for a link for investors (often near the bottom of the page).