Eggcrate is a plastic sheeting normally used as a diffuser for commercial fluorescent lights in offices. It has a network of squares.
It's used to help protect the bottom of the tank. It's more commonly used for tanks with large, stacked rocks, such as a cichlid tank, in case the fish knock the rocks down. Even though my tanks aren't at high risk, I still like to put it at the bottom for extra security. If nothing else, it makes me feel better while moving rocks and things around as I play with design ideas. Placing rocks on bare glass makes me cringe.
You can see the eggcrate in the pictures I'm about to post, especially the last one.
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