Summary: Network security means that the hardware and software of the network system and the data in the system are protected, and will not be damaged, changed, or leaked by accident or malicious reasons. The system runs continuously and reliably and the network service is not interrupted. From the perspective of network operation and management, we want to protect and control the access, reading and writing operations of local network information, avoid the threat of "trap door", virus, illegal access, denial of service and illegal occupation and control of network resources, and stop and defend the attack of network hackers.For the security and confidentiality departments, they hope to filter and block illegal, harmful or state-secret information, avoid the disclosure of confidential information, avoid harm to society and cause huge losses to the country. While the system processing capacity is improved, the system connection capacity is also continuously improved. However, with the improvement of the connection ability information and circulation ability, the security problem based on network connection has become increasingly prominent. The overall network security is mainly reflected in the following aspects: physical security of the network, network topology security, network system security, application system security and network management security. Therefore, the computer security problem should be like the fire security problem in every household, so as to prevent it from happening. When you don't even think of yourself as a target, the threat is there.

Link to Websites: 1. https://baike.baidu.com/link?url=kvfTSkDUh6q8hOtuLL-DpHBjmwxKf4OvNCILK6yW8JzxD_ie5sy6yMGbEBIrmon2bHEYe2VowbsvJHKwBzlx-TKFP8GfbMnFiLlJYRoIjpxM4hGBRU-Sh0yYGFdn-Wpm 2. https://www.paloaltonetworks.com/cyberpedia/what-is-network-security 3. https://en.wikipedia.org/wiki/Network_security

Questions: 1. Why is security important? 2. Is hardware or network security more important? 3. What is the future of security industry?