Rootkit - A rootkit is a malicious software bundle designed to give unauthorized access to a computer or other software. Rootkits are hard to detect and can conceal their presence within an infected system. Hackers use rootkit malware to remotely access your computer, manipulate it, and steal data.

Malware - Malware is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, deprive users access to information or which unknowingly interferes with the user's computer security and privacy.

Trojan Horse - A Trojan horse, or Trojan, is a type of malicious code or software that looks legitimate but can take control of your computer. A Trojan is designed to damage, disrupt, steal, or in general inflict some other harmful action on your data or network. A Trojan acts like a bona fide application or file to trick you.

Phishing - Phishing is a type of social engineering where an attacker sends a fraudulent message designed to trick a human victim into revealing sensitive information to the attacker or to deploy malicious software on the victim's infrastructure like ransomware.

DOS Attack - In computing, a denial-of-service attack is a cyber-attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network.

Man in the Middle Attack - A form of active wiretapping attack in which the attacker intercepts and selectively modifies communicated data to masquerade as one or more of the entities involved in a communication association.

Ransomware - Ransomware is a type of malware from cryptovirology that threatens to publish the victim's personal data or perpetually block access to it unless a ransom is paid.

Nagware - computer software that is free for a trial period during which the user is frequently reminded on screen to register and pay for the program in order to continue using it when the trial period is over.