What is Keylogger?

The name “Keylogger” becomes from “ Keystroke logger” and is used to obtain confidential data (for example: passwords, login info, etc) by key-pressing.

What is Adware?

Programs belonging to this class display advertising, usually in the form of banners. They also redirect search requests to advertising sites. Apart from displaying advertising, there is usually no other visible sign that adware is present on the host system: they do not add icons to the system tray, and there is no sign in the Program Menu that files have been installed. Adware programs often do not have a de-installation routine.

What is Rootkit?

A rootkit is a collection of programs used by a hacker to evade detection while trying to gain unauthorized access to a computer. This is done either by replacing system files or libraries, or by installing a kernel module. The hacker installs the rootkit after obtaining user-level access: typically this is done by cracking a password or by exploiting a vulnerability. This is then used to gather other user IDs until the hacker gains root, or administrator, access to the system.

The term originated in the Unix world, although it has since been applied to the techniques used by authors of Windows-based Trojans to conceal their actions. Rootkits have been used increasingly as a form of stealth to hide Trojan activity, something that is made easier because many Windows users log in with administrator rights.

What is Trojan?

trojan, is malware that appears to perform a desirable function but in fact performs undisclosed malicious functions. Therefore, a computer worm or virus may be a Trojan horse.