These are textures that will be added or multiplied with your diffuse texture.
Look at this image - you have two textures at the top.
When you multiply them, you will get what's on the bottom left corner of this image, and when you add them you will get whats in the bottom-middle part of image:
Of course these textures don't have to be mapped with the same UV coordinates. You may, for example - cover entire terrain with satellite image, and then add some extra texture, more densly mapped, to add some details to that image.
Not the way of making terrain that I would support, but a good example for multitexturing.
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