- Cybercrime
- Spamming
- Identity Theft
- Hacking
- Phishing
- Botnet
- Denial of Service (DOS) Attack
- Firewall
- Virus
- Any illegal activity that uses a computer as its primary means of commission
- Sending the same message indiscriminately to a large number of Internet users
- The fraudulent practice of using another person's name and personal information in order to obtain credit, loans, etc.
- Gaining unauthorised access to data in a system or computer
- The fraudulent practice of sending emails purporting to be from reputable companies in order to induce individuals to reveal personal information online
- A network of private computers infected with malicious software and controlled as a group without the owners' knowledge, e.g. to send spam.
- An attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet
- A security barrier designed to keep unwanted intruders "outside" a computer system or network while allowing safe communication between systems and users on the "inside".
- A malicious program or code that attaches itself to another program file and can replicate itself and thereby infect other systems