DNA replication is the process by which the entire genome of a cell is copied prior to cell division. There are several enzymes involved in the replication process, each of which solve a specific problem or perform a specific function. They include
DNA Helicase - unwinds the double stranded helix so that the other enzymes can attach to the leading and lagging strand.
DNA Ligase - bonds new stands together.
DNA polymerase - adds new base pairs to match the template strand.
RNA Primase: Attaches RNA primers to the replicating strands.