Semiconservative replication is the mechanism by which DNA replication occurs in all known cells.
DNA replication is the process of dividing a double-stranded DNA molecule into two identical DNA molecules.
DNA replication occurs at a variety of locations along the DNA template strand.
Replication is essential because every time a cell divides, the two new daughter cells must contain the same genetic information, or DNA, like the parent cell.
Semiconservative replication is so named because one of the strands of DNA in each of the two copies of DNA is ancient and conserved while the other is newly produced at the moment of replication.