The G2 phase is a part of the cell cycle that occurs after DNA replication in the S phase and before mitosis. During this phase, the cell undergoes a series of checks to ensure that DNA has been accurately copied and is free of damage. This preparation is crucial for the cell to divide successfully. In the G2 phase, the cell also grows and produces proteins necessary for mitosis. It ensures that all cellular components are ready for the upcoming division, which is essential for maintaining proper function in daughter cells. This phase is vital for the overall health and stability of the organism.