1. Mitosis: This is the process of cell division that produces two identical daughter cells from a single parent cell. It is essential for growth, development, and repair of tissues.

2. Meiosis: This is the process of cell division that produces four daughter cells, each with half the number of chromosomes as the parent cell. It is essential for sexual reproduction, producing gametes (sperm and egg cells).

DNA replication is a crucial step in both processes because it ensures that each daughter cell receives a complete and accurate copy of the parent cell's DNA.