Cyber security refers to technologies and processes designed to protect computers, networks, and data from unauthorized access and cyber attacks. It includes communication, network, and information security. Cyber crimes are criminal acts committed via the internet, with the earliest recorded in 1820. Common cyber crimes include illegal access, interception, interference with systems and data, misuse of devices, and fraud. Cyber security helps defend against hacks and viruses through tools like antivirus software, firewalls, and strong passwords. The only fully secure system is one that is powered off and unplugged, so individuals should pay attention and act smart online.