Suppose a person gets fired from his current job. He is in the second round of interviews with another company. How does he tell the company about his termination from his former company?
Although I must admit that I was never in such a situation before. I would have to advocate "Do not say anything" unless they ask. When they do, be truthful and frank about the nature of your separation. If at fault, portray it as a lesson that you have learned and will not commit again. If not, explain as succinct as possible what happened. Something to think about is if you asked any of your former coworkers as references.