See for background and details: https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life

Summary: The universe of the Game of Life is an infinite two-dimensional orthogonal grid of square cells, each of which (at any given time) is in one of two possible states, "live" (alternatively "on") or "dead" (alternatively "off"). Every cell interacts with its eight neighbours, which are the cells that are directly horizontally, vertically, or diagonally adjacent. The way the pattern of cells develops is driven by two rules, the so-called "Birth- and Survival-rules". The result looks like a busy scene of moving "micro-organism"-like creatures, crawling, expanding, dying out and re-emerging.