You can think of it as the “front” and “back” of the face.
The problem in this case is that each face of your model has an orientation. Go into Edit Mode, select everything (press A), then press ctrl+N. If the problem still persists, you can recalculate the normals. Then press alt+M in order to merge the affected vertices. If that doesn’t help, in Edit Mode press ctrl+alt+shift+M. To fix this, go into Edit Mode, then press A to select all vertices, then press W and “Remove doubles”. that two vertices are positioned at the same location. One is that one or more vertices are duplicated, i.e.
These show up as red lines and result in a model where two faces are not connected although they should be. Sometimes it so happens that a seemingly perfect model in Blender has unconnected edges in Pepakura. I work with the combination of Blender and Pepakura for creating paper models.
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