Question

Which monitors user activity on internetand transmits that information in the background to someone else?

Answer 1

Spyware.. monitors user activity on internet and transmits that information in the background to someone else.

Spyware is a software which gather the information about person or organisation with their knowledge and send same to othrr person without the consent of anyone....

Spyware" is mostly classified into four types: 

adware,

system monitors

tracking cookies,
and 

trojans;