G1 is growth 1. This is where the cell is growing and doing normal tasks. The cell spends most of its life here.
S is synthesis. This is where DNA is being copied/replicated. This is the first step towards mitosis.
G2 is the growth 2 stage. This is where the cell is preparing for mitosis. The cell is doing final preparations in this stage.
M is mitosis. Mitosis is the process of cell division. This can further be separated into “PMAT-C” or prophase, metaphase, Anaphase, Telophase, and Cytokinesis.