What sort of things can spy on your computer?

i read a question earlier where someone was claiming in this day and age many things can spy on you, on your computer including; your isp, your web browser, google, your operating system and other things. it made me wonder what sort of things would spy on your computer now? on your personal laptop or desktop pc?,... show more i read a question earlier where someone was claiming in this day and age many things can spy on you, on your computer including; your isp, your web browser, google, your operating system and other things.

it made me wonder what sort of things would spy on your computer now? on your personal laptop or desktop pc?, and what type of things would they spy on on a persons computer?
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