Is a type of malware that can be installed on computers,
and which collects small pieces of information about users
without their knowledge. The presence of spyware
is typically hidden from the user, and can be difficult to detect.
Typically, spyware is secretly installed on the user's
personal computer. Sometimes, however, spywares
such as keyloggers are installed by the owner of a shared,
corporate, or public computer on purpose in order
to secretly monitor other users.