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DNA repair refers to the cellular processes that correct damage to DNA molecules. This crucial mechanism ensures the integrity of the genetic material by fixing various types of DNA lesions, such as base pair mismatches, single-strand breaks, and double-strand breaks. DNA repair mechanisms are essential for maintaining genome stability and preventing mutations that can lead to diseases like cancer. Various pathways, enzymes, and proteins are involved in different types of DNA repair, including nucleotide excision repair, base excision repair, mismatch repair, homologous recombination, and non-homologous end joining. These processes play a vital role in preserving the genetic information and ensuring the proper functioning of cells.