I understand this is probably a very stupid question to some of the people on here, but none the less i would still like to know. It hasn't been explained very well to me. I have a vague understanding that it is a number that you collect for each possible path? Please correct/elaborate on this if possible? I was also told the phase represents the position in the cycle of a wave, whether it is at a crest or trough or some precise position in between. How do find the position it represents and how can you label an infinite number of paths with phases? How do you find the position in the cycle of a wave?