DNA evidence refers to biological material that contains genetic information, which can be used to identify individuals. This evidence is often collected from sources such as blood, hair, skin cells, or bodily fluids at crime scenes. By analyzing the unique patterns in a person's DNA, forensic scientists can match samples to suspects or victims, helping to solve crimes. The process of analyzing DNA evidence involves techniques like polymerase chain reaction (PCR) and DNA profiling. These methods allow scientists to create a genetic profile that can be compared against databases or samples from individuals. This powerful tool has revolutionized criminal investigations and exonerated wrongfully convicted individuals.