This is often a question asked early in an interview to gauge familiarity with the company, and also as a way to see if the interviewee has done any background research into the company or their work product. Engineers are expected to have a high-level understanding of the business they work for, but you don't need to have encyclopedic knowledge at the interview stage. When preparing for this sort of question, take a look over their website and additional online presence, including any recent headlines or relevant information.