Computer and internet security is important because technology is used for many essential aspects of life. Without proper security, personal information like credit cards, social security numbers, and addresses could be at risk. There are various internet crimes like fraud, hacking, scams, and cyberstalking. Viruses are programs that can copy themselves and infect computers, often through email attachments or downloaded files. People should take precautions like using antivirus software, being wary of emails from unknown senders, and protecting personal information online to help prevent security risks.