Here is an interesting article from the appendix of Principles of Marketing (11th ed.) book:

As the old saying goes, "the CV gets you the interview, the interview gets you the job."

Before the interview

• understand that the interviewers have diverse styles, including the "chit chat", let's-get-to-know-each-other style; and the tough probing "why, why, why" style, among others. So be ready for anything.
• Prepare at least five good questions whose answers are not easily found in the company literature.
• Anticipate possible interview questions - "why do you want to work for this company?" or "Why should we hire you?". Prepare solid answers before the interview. Have a clear idea of why you are interested in joining the company and the industry to which it belongs.
• Dress conservatively and professionally. Be neat and clean.
• Arrive early, be courteous and polite, approach the interview enthusiastically. Let your personality shine through.

During the interview

• Shake hands firmly in greeting the interviewer. Introduce yourself, using the same form of address the interviewer uses. Focus on creating a good initial impression.
• Maintain eye contact, good posture and speak distinctly. Sit comfortably in your chair. Relax, smile when appropriate.
• Present your selling points. Let the interviewer take the initiative but don't be passive. Find an opportunity to direct the conversation to things about yourself that you want the interviewer to hear.
• Don't hesitate to "close". You might say, "I'm very interested in the position, and I have enjoyed this interview."
• A tip for acing the interview: Before you open your mouth, find out what it's like to be a brand manager, sales representative or other position for which you' re interviewing.

After the interview

• Analyse the interview objectively, including the questions asked, the answers to them, your overall interview presentation and the interviewer's responses to specific points.
• Immediately send a thank-you letter, mentioning any additional items and your willingness to supply further information.
• If you do not hear within the specified time, write or call the interviewer to determine your status.

If you are successful, you will be invited for the in-company interview. The organisation will examine your interest, maturity, enthusiasm, assertiveness, logic and company and functional knowledge. You should ask questions about issues of importance to you. Find out about the working environment, job role, responsibilities, opportunity for advancement, current industrial issues and the company's personality.

The company wants to discover if you are the right person for the job, whereas you you want to find out if it is the right job for you. The key is to determine if the right fit exists between you and the company.