I'm taking an Electrodynamics course right now and we're using Green's Functions to describe different charge systems. I can do the math, or at least copy the math my professor did in class, but I'm having a difficult time figuring out why Green's Functions are useful. If anyone out there is familair with this subject, I'd appreciate your interpretation. I just would like to have a more intuitive feel for this. Why do we use it? What does it do for us? Please help if you can.