DNA replication makes two identical copies of a DNA molecule. This process is essential for cell division, as it ensures that each new cell receives a complete set of genetic instructions.

Here's a more detailed explanation:

* Original DNA molecule: The starting point is a single, double-stranded DNA molecule.

* Unwinding: The DNA molecule unwinds and separates into two strands.

* Complementary base pairing: Each original strand serves as a template for a new strand. Nucleotides (the building blocks of DNA) are added one by one to the template strand, following the base pairing rules (adenine with thymine, guanine with cytosine).

* New DNA molecules: Two identical DNA molecules are formed, each consisting of one original strand and one newly synthesized strand.

In essence, DNA replication copies the entire genetic code of an organism, ensuring that each daughter cell inherits a complete and accurate set of genetic information.