I'm sure everyone has wondered this. Interviewers always ask you very open-ended questions with the intentions of not only getting to know you better, but to truly understand your inner-workings and to see if you'll be a good fit for their office culture. Below is a link to a great article outlining several very common questions that you could be asked during an interview, along with an explanation as to what exactly they're trying to find out about you...
If you're out looking in the job market for something new (or you're currently unemployed), now's your chance to take your search a step further and properly educate yourself so that when you do land that interview, you'll be well prepared, and that much more likely to actually get the job.
http://mashable.com/2012/01/15/interview-questions-decoded/