The Rules - Simplified:

1. Survival: A live cell with 2 or 3 live neighbors stays alive.
2. Death: A live cell with fewer than 2 or more than 3 live neighbors dies.
3. Birth: A dead cell with exactly 3 live neighbors becomes alive.
4. Stasis: All other cells remain in their current state.

The Rules - Classic:

1. Underpopulation: A live cell with fewer than two live neighbors dies.
2. Survival: A live cell with two or three live neighbors lives on to the next generation.
3. Overpopulation: A live cell with more than three live neighbors dies.
4. Reproduction: A dead cell with exactly three live neighbors becomes a live cell.