Neural networks (NNs) are intelligent programs that model the pattern-recognition capabilities of the human brain, thereby endowing machines with the ability to idetify and classify faces, voices, pictures, and written characters. They have excellent pattern-recognition capabilities and can also learn new information and behavior. The can process large volumes of information, even if the information is inaccurate or incomplete, and recognize problem-solving patterns that the human eye may be unable to discern. Neural networks are programs that model the intercnnections of human brain cells.