Feyman Diagram - Represent QED model(s)?

[Simone_beet]

Hi - could someone briefly explain a Feyman Diagram (example?). Does this replace one or more complex QED model(s)? Thank you.

 

[GRB 080319B]

These are two sites that give good descriptions of what Feynman diagrams are. The latter is a bit more in depth:
http://www.physlink.com/Education/askexperts/ae263.cfm"
http://en.wikipedia.org/wiki/Feynman_diagram"

Also, here are some great videos where Feynman himself teaches QED. He describes the diagrams in the 3rd video:
http://www.vega.org.uk/video/subseries/8"

 

[Simone_beet]

Thank you very much. The more I read the message board contents, the more it becomes apparent that this is not so much a Q&A or "where can I find it" as a forum to post an in-depth specific topic vs. something that I could have googled. None the less, it appeared to be a place for 'lovers of physics' e.g. me. I appreciate your time to reply.