Make a research

Before going to the interview make a research on the company. Check out their website to see information such as how long they have been in the business what is the structure of the company, its nature and everything else you need to know to make you feel comfortable while talking with the interviewer and be able to answer questions, in a professional way, showing you have a familiarity with the company. If the interviewer asks something you dont know about the company, be honest and say you dont know the answer and dont make up stories.