DNA Replication

DNA replication is the process of creating an exact copy of a molecule of DNA. This replication is said to be semi-conservative, because each new molecule of DNA contain one strand from the original molecule, and one new parent strand.
Replication starts at a specific nucleotide sequence, called replication origin. An enzyme called helicase, binds to the DNA molecule and unravel it. An enzyme called primase construct a short stand called primer. This primer will be the starting point for the attachment of new nuclotides, which is a job of the enzyme called  DNA polymerase, in a process called elongation.
However, the DNA is anti parallel. The replication can occur continuously in one strand called leading strand and in other one lagging strand is replicated in short segments called Okazaki fragment. To end this process DNA ligase, spliced all this together.