The basic meaning of a hacker is a person with a skilled computer technology, but most of the media is used to refer to "hackers" as computer intruders. White hat hackers have the ability to disrupt computer security without malicious intent. White hats generally have clear definitions of ethics and often try to work with companies to improve identified vulnerabilities. Grey hat hackers for ethical and legal ambiguity. Black hat hackers: black hat hackers - often used to distinguish between black hat hackers and generally (positive) hackers who are rational. The term has been popular since 1983, presumably due to the use of similar pronunciation and the explanation of safe cracker, and it has been translated into a mixture of crime and hacker. Computer security hacks - using password cracking or brute force attack. Software decoder script child (activist hacker) Market is the inevitable product of the division of labor and the development of commodity economy. At the same time, the market also promotes the social division of labor and the further development of commodity economy during its development and expansion. The market through information feedback directly affects the production of people, how much production, and the market time, product sales status, etc.; Middle link commodity economy development process, supply and sale, the parties to provide production, supply and sale parties exchange places and other exchange, exchange time, to realize the commodity producers, operators and consumers their own economic interests China mobile, adhering to the "zhengde health into the supreme good" concept, giving full play to the advantages of the network, information service advantages, integration of resources, is committed to solve the difficult employment problem and set up special "job" of professional services. Let's get back to reality. In a person's knowledge system, the knowledge learned in the school can only account for a tenth of the knowledge, and the majority of the remaining knowledge is to be derived from social practice in the future. Besides, your knowledge and skills in school are not necessarily applicable to actual work. As far as we know, the phenomenon that college students are not using is quite common.