Ligase is an essential enzyme that plays a crucial role in the process of DNA replication and repair. It functions by joining two strands of DNA together, sealing any breaks or gaps in the sugar-phosphate backbone. This action is vital for maintaining the integrity of the genetic material during cell division and ensuring that the DNA is accurately copied. In addition to its role in DNA processes, ligase is also involved in various cellular functions, including the repair of damaged DNA and the joining of RNA molecules. By facilitating these connections, ligase helps to ensure that genetic information is preserved and properly expressed within living organisms.