Professionals who are keen on researching and writing programs, proficient in various computer languages and systems, must have the characteristics of being willing to get to the bottom of the matter and not good at studying problems. The word "Hacker" is translated from English by English hacker, which refers to computer enthusiasts who specialize in studying and discovering computer and network vulnerabilities. They grow with the development of computers and networks. Hackers have a fanatical interest and persistent pursuit of computers. They are constantly learning computer and network knowledge, looking for loopholes in computers and networks, and like to challenge difficult network systems and find loopholes from them, and then propose solutions and remedial measures to administrators. Hackers do not interfere in politics and are not used by politics. Their appearance has promoted the development and perfection of computers and networks. What hackers do is not malicious destruction. They are a group of heroes who pursue sharing and freedom and advocate freedom and equality. Hackers exist because of the imperfection of computer technology. In a sense, computer security needs more hackers to maintain. To borrow a sentence from myhk, "The meaning of hacker's existence is to make the network safer and more perfect". But today, the word "hacker" has been used as a spokesman for those who use computers to destroy or invade others. The correct name for these people should be cracker, and some people translate it as "hacker". It is precisely because of the appearance of these people that the word "hacker" has been defiled. People confuse hackers with hackers, and hackers are considered as people who sabotage the Internet. Even if a hacker has reached the level of hacking in consciousness and technology, he will never call himself a hacker, because hackers are only recognized by everyone and have no self-styled. They attach importance to technology and pay more attention to thought and quality. In the hacker circle, the word hacker is undoubtedly positive, for example, system hackers are familiar with the design and maintenance of operating systems; Password hackers are good at finding out users' passwords. If they are computer hackers, they are experts who are familiar with computers and can make them obey. Hacking is basically a hobby, usually out of one's own interest, not for making money or working. According to Eric Raymond, the founder of the open source project, hackers and crackers belong to two different worlds. The basic difference is that hackers are constructive, while crackers are good at destruction. Hacker originally meant workers who cut wood with axes, and the earliest entry into the computer circle can be traced back to 1960' s. Brian Harvey, a computer professor at the University of California, Berkeley, wrote in his textual research on the word that MIT students are usually divided into two factions. One is a tool, which means "dear" students. They all got a score. The other is the so-called hacker, that is, those students who often skip classes and love to sleep in class, but are full of energy and like to engage in extracurricular activities at night. In fact, the original intention of a hacker is a person who visits other people's spaces or blogs all day. Hacker means "hacker" today. However, because the hacker's "hài" is similar to the hacker's "hà i", people who are mistaken for sabotage on the network are called "hackers".