Job Hunting Dilemma: How to Explain Why You Left Your Last Company to HR?

If somebody leaves their existing job and is searching for another job, what are the various reasons for leaving the previous company that they can give to convince HR or company management during the interview?

I would recommend saying whatever is true. What you wrote in the resignation letter to the previous company, the same reason should be mentioned in the interview. Do not think of making an impression with the reason; there are other means to impress the interviewer, such as command over language, presentation skills, dressing up, body language, knowledge, and skills, as well as knowledge about the company, its products, business, latest news, etc. So, go ahead and face the interview with all the truth.

It's very difficult to assume which reasons or words impress anybody because every person is born with a different attitude and behavior. If I were in your place, I would follow Archana's words. What she is saying is absolutely correct—be true to the respective hiring person.

Best of luck