You want to avoid being dishonest, even if you were fired for reasons that embarrass you. The interviewer wants to hire honest employees, and being open in the interview shows your integrity and character. If you gave notice, they want to hear why you left. Avoid saying anything negative about your previous employer or coworkers, which shows you may be challenging to work with. If you did not get along with someone at your last job, describe your reason for leaving as you were looking for a position where you could advance your career or utilize your skills in a better way.

"I left my last job as a plumbing apprentice to pursue a career as a tile installer. I wanted to follow in my father's footsteps and work as a plumber, but after six months as an apprentice, I realized plumbing was not for me. I enjoy being creative at work and feel that setting tile is more suitable for me."