'Maps' are the worlds in which your game characters walk around in. Called Maps of Levels they are built up from brushes and then painted with map textures in the same way a house is decorated with paint or wallpaper. I rarely get time to work on maps in my freetime but i love making them.
Soleburn - I've been playing with the HH3 textures myself finally, my favourite out of the set is the Singlemalt stuff so thats what i've mostly been usuing. Its going to be a mid sized DM level.