I saw the question http://physics.stackexchange.com/questions/3038/what-are-field-quanta but it's a bit advanced for me and probably for some people who will search for this question.

I learned QM but not QFT, but I still hear all the time that "particles are the quanta of fields" and I don't really understand what it means.

Is there a simple explanation for people who know QM but not QFT?