Spyware is software that aims to gather information about a person or organization without their knowledge and gives the access to someone else.
(i) Virus : A computer virus is an executable software that spreads from one computer to another.
**OR**
A piece of code which is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.
**OR**
Any other correct definition
(ii) Hacker : A hacker is an individual, who breaks security for non-malicious reasons to test the security of a system.
**OR**
A hacker practices to modify/alter computer software/hardware and informs the creator about the security issues.
(iii) Cracker : A cracker is a person who violates computer security for malicious intentions or for personal gain
A cracker is a person who violates computer security for malicious intentions or for personal gain
**OR**
A cracker practices to modify/alter computer software/hardware and uses it for personal gains/ to trouble the creator.
