What is a special class of adware that collects data about the user and transmits it over the Internet without the user’s knowledge or permission?

The answer is "Spyware".

Explanation:

Spyware is a supplementary program that is mounted on your customer computer and it transmits the data without authorization via the Internet. Its business includes ads, private data, and improvements in the user interface, which is why it has become recognized as the special adware class that collects and transmits user information over the web without the user's permission.

go to the black logo in top left corner of page and click and you are there

answer(igmp);