WHY GRASS?

[CSCI2662 at CL.UH.EDU]

I have been using grass for a couple of weeks now. I managed to convert
a tiff and giff file to the GRASS format and get it up on GRASS. My
question is as follows.

	OK. I get a tiff image up on GRASS. Then what? What is the advantage
of getting an image up on GRASS. Is there a method of interactively viewing
the image. Can you querry a map. In short WHAT CAN YOU DO WITH IT?

	Will appreciate a quick responce