Fingerprints: Fingerprints are unique patterns of ridges, lines, and curves found on the surface of the skin on the fingertips. Fingerprints can be used to positively identify individuals by comparing the patterns of two different prints. Fingerprints are classified into three different types: arches, loops, and whorls. Handwriting: Handwriting is the process of creating written symbols and letters with a pen or pencil. Handwriting is used to create documents such as contracts, legal documents, and letters, and it is also used as a form of personal identification. Handwriting analysis can be used to determine the age, gender, and ethnicity of the writer. DNA Evidence: DNA evidence is a form of forensic science that uses DNA samples to identify individuals. DNA evidence can be used in criminal investigations to link suspects to a crime scene. There are two main types of DNA evidence: nuclear DNA, which is unique to individuals, and mitochondrial DNA, which can be used to trace family relationships.