Does Linux OS need Silverlight?
In windows, sometimes it will prompt you to update Silverlight.

No.

But if you find yourself wanting to watch something that requires silverlight, there is an opensource project called moonlight that may be good enough at this point to work.

the only time when i heard about Silverlight was some years ago on micro$soft.com as an advert ..

however i've never seen any website on the net using this piece of crap (by default anything that is produced my M$ is crap according to their historical track record) , bill baites and his evil crew have lost their grip on the web anyway.

In linux, silverlight is equivalent to what?

I don't understand.

I mean Silverlight is needed in Windows Internet Explorer for certain video clips,
if u want to view the same video on the same website in Linux, what Addon do u need?

Was already pointed out to you:

The thing is moonlight wont work for Netflix due to the DRM involved...at least thats what Ive heard, cant confirm nor deny this tho personally.

For example, for some unclear reason, the Stanford School of Engineering web site (that contains a lot of free video lectures) uses "this piece of crap" called Silverlight. Sad but true.

Silverlight is still relevant because it is still in use. Microsoft and Apple have it and I believe there is a Silverlight for Android. The question begs, why is there no Silverlight for Linux. Moonlight does not work with programs that require Silverlight, so once again Linux users are forced in some cases to splash out on Microsoft/Apple. I really dislike this situation.

Silverlight is a runtime package for Microsoft's "dot-Net" programming framework.

And, actually it's a pretty darned good idea. Instead of monkeying-around with Javascripts, they wrote a set of native programs to act as a known, operating-system agnostic client.

Microsoft's only problem, and it appears on a number of fronts, is that they senselessly ignore Linux. It's not that they can't produce for Linux: they can. (They also acknowledge OS/X, at least to some degree.)

This corporate blindness has cost them a great deal of money over the years, and I hope that they will one day figure out that "Windows®" is never going to be the entirety of their future, especially in the mobile space (which they IMHO completely missed .. swoosh).

Yes, I agree with what you say. I think that Microsoft's paranoia about sharing technology is one of the main reasons why people distrust and dislike them.

There's at least one exception (... being so bad that it's both disturbing an laughable):

Try uploading your request for your Secure Boot stuff and you'll notice how it fully depends on
Silverlight.

Isn't it fairly well established that you can run Silverlight in Firefox in Wine, if you really want to?

No.
Still no drm+many_other stuff (different libs).