The interviewer would like to know your motivation for leaving your current position. When discussing your current job be sure to stay in a positive mindset and keep the conversation light. There are many legitimate reasons for leaving a job. Be sure to be clear about your reasoning, and be honest. Stay away from any negative response! That is a complete interview killer.
"I am looking for a new position as the volume in my current role has decreased significantly, and I am facing a potential layoff."
Entry Level answer example
"I currently work in a practicum placement, as a requirement to complete my degree. This practicum will be coming to an end this month which is why I am now seeking a full time, permanent opportunity."
Experienced answer example
"I am looking for a new opportunity as I have reached my peak in my current role. The company I currently work for is smaller and family owned. I am interested in this role because you are an advanced work environment with more opportunities to take on larger projects."