IT refers to people who are good at IT and computer scientists. Hackers are proficient in various programming languages and operating systems that grow with the development of computers and networks. The word "Hacker" is by the Hacker English transliteration of the English words themselves and no obvious good or bad, is according to the context in English application occasions of judgment, the idea is similar to Chinese dialogue often mentioned employs a person, the gunners, experts like words. In information security, "hacker" means the person who studies the computer security system. Using public communication networks, such as the Internet and telephone systems, to load the other's systems without permission are called black hat hackers. A white hat hacker (English: white hat), who debuts and analyzes computer security systems. The term "hacker" was first used to refer to people who study the use of telephone systems The marriage certificates of the children always mention the death or not of their parents. In the most recent civil status records, the date and place of death are even mentioned. Similarly, the death certificates of the children make it possible to know whether their parents were deceased or not, but without more precision.