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DNA fingerprinting is also know as DNA profiling is a process of determining an individuals DNA characteristics. This is a forensic technique in criminal investigations, comparing criminal suspect's profiles to DNA to identify the like hood of their involvement in the crime. Also can be used for paternity tests. 99 % of human DNA sequences are the same in every person. Remaining sequences are different . It makes every individual unique. This is used to distinguish and identify the individuals of a same species by using their DNA samples. These biological samples may be blood, hair, saliva , semen , body tissue cells. The DNA samples are isolated first. Then digested by restriction endonucleases . After this electrophoretic separation of fragments are done. These fragments are transferred into nylon or nitrocellulose membrane . This is followed by probing , hybridization and autoradiography . From this banding pattern is analyzed.