Mismatched repair is a cellular process that corrects errors that occur during DNA replication. When DNA is copied, sometimes the wrong bases are paired together, leading to mismatches. This repair system identifies and fixes these errors to maintain the integrity of the genetic information. The mismatch repair system involves several proteins that recognize the mismatched bases, remove the incorrect section of DNA, and fill in the gap with the correct nucleotides. Proper functioning of this repair mechanism is crucial, as defects can lead to increased mutation rates and are associated with certain types of cancer.