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what is an edge ?

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hi, i want to write a simple bsp renderer. i read a tutorial so i only know the theoretical part of bsp-tree generating and bsp rendering. i decided to use quake2-bsp''s because i found the tutorial from flipcode about the quake2 bsp-file format. first of all i dont''t want to render only the cluster i am in, i want to render all faces in the map. but i don''t understand what an edge is. if i understood it correctly, an edge has two indices into the vertexarray. but ... aaammm ... ?????!!!???? can someone explain me what an edge is or how can i use it ??

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Well think of what an edge is in reality and thats pretty much what it is in 3D theory.

Lets say you have a cube:

|\ |\
| \______|_\
| |H | |G
D \| \|

A-B is an edge, B-C is an edge, C-D is an edge D-A is an edge
D-E is an edge E-F is an edge, F-G is an edge G-B is an edged, G-H is an edge, etc...

A-C is not an edge, B-D is not an edge. A-F is not an edge, B-E is not an edge, etc...


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