Rule 110
Rule 110 maps 000 to 0, 001 to 0, 010 to 0, 011 to 0, 100 to 0, 101 to 0, 110 to 0, and 111 to 0.
Change the parameters
If no initial value is provided, the cells are set to random values. If an initial value isn't provided for every cell, the provided sequence of values is repeated until every cell is provided for, going from left to right.
The seed is used to seed the pseudo-random number generator. If no seed is provided, the system will "randomly" choose one. It's useful to specify a seed here if you wish the results to be easily reproducible.
More information on cellular automata and their applications can be found in Stephen Wolfram's A New Kind of Science.