Cyber ​​security is necessary to protect your computer and the data stored or accessed on your computer. Computers are used at work, in schools and for research. They also support critical business processes. Computers also protect companies' personal and sensitive information. The meaning of cybersecurity has changed over the years. In the past people didn't have to worry about someone putting a virus on their computer, the only problem they had was someone getting it from them. There were viruses, but they were used for mainframes and therefore did not work, nor for personal computers. Even at that time there weren't many personal computers in use. Many people in the past couldn't afford them. Then there were people who didn't know what computers were and what they did. Nowadays it is not possible to find a person who does not know what a computer is for. Today, most people have at least one computer of some kind in their homes. In the business world people would lock their computers in the computer room to prevent them from ruining the machine. The machines were too big to make. The main frames were huge machines that took up a lot of space. You didn't have to worry about anyone moving them. Today, computers are much smaller in size. These computers are portable and therefore can be transported, but this is not the main problem. The main problem comes into play when there are people who steal data from your computer while you are browsing the Internet. All users want to prevent their computer from being stolen and the data on their computer from being stolen. Users don't want anyone to put viruses on their computer or anything that can damage it. Some companies only allow strict access…half of paper…spyware or antivirus. Additionally, these programs can remove malware and malware can be detected. Malware is any software activity that damages or blocks the activity of a computer system service. The types of malware are spyware, keystroke loggers, worms, and Trojan horses. Application authorization is another part of application security. Application permission allows the owner of the software to only have rights to the application. There may be other uses that can insert data, but cannot modify data or delete data. The programs are set up so that users who do not have permissions can use the programs but cannot make changes to the programs. Input validation is the process of validating data entered into a system. If the data is not validated, there will be more errors in the output and erratic system behavior. When it's bad