Before you go on a job interview, it's important to find out as much as you can about the company. Company research is a critical part of interview preparation. It will help you prepare to both answer interview questions and to ask the interviewer questions. You will also be able to find out whether the company and the company culture are a good fit for you.
Take some time, in advance, to discover as much information as you can about the company. Spend time, as well, tapping into your network to see who you know who can help give you an interview edge over the other candidates.
Here's more advice on how to research a company.