Define cytokinesis.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Cytokinesis**: Cytokinesis is the process that occurs at the end of cell division, specifically during the final stages of mitosis or meiosis. It is the phase where the cytoplasm of a parental cell is divided into two daughter cells.

2. **Process Overview**: During cytokinesis, the cell's cytoplasm is split, leading to the formation of two separate but genetically identical daughter cells. This is crucial for the continuation of life and growth in multicellular organisms.

3. **Mechanism in Animal Cells**: In animal cells, cytokinesis is characterized by the formation of a contractile ring made of actin and myosin filaments. This ring contracts and pinches the cell membrane, creating a cleavage furrow that deepens until the cell is divided into two.

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