Is Microsoft Silverlight an optional tool for windows OC? what are its uses? Can one work for basic internet use without Silverlight installed?
Silverlight is rarely used; only about 2% of websites worldwide use it. Netflix uses Silverlight, and few other websites use Silverlight, but generally, most users can go through life browsing the internet without it. One should not have to install it unless a website asks for it to be installed, otherwise web browsing should not suffer without Silverlight installed. More statistics about how it is used here: http://w3techs.com/technologies/details/cp-silverlight/all/all.
Think Adobe, think Silverlight. The difference being Flash is Adobe and Silverlight is Microsoft.
In a nutshell, Silverlight does a similar job to Adobe Flash (although it's not a version of it, as Hovsep suggests). It allows designers to build "apps" into web pages, with fancier animation, user interface and connectivity than that offered by ordinary web pages. See http://www.microsoft.com/silverlight/what-is-silverlight/ for more.
The idea is good, but it came late in the day, so those developers who want the functionality of Flash mostly use Flash. Do you need it? It's one of those things that are really difficult to answer. Probalby not, but if you try to access a site that uses it, then you'll need it...
However, there's really no reason not to have it. It uses some disc space, but unless you use it, it's not going to use more memory or slow down your PC.
Is there a list of pages requiring silverlight?
Silverlight is like a Microsoft version of Adobe Flash. You Microsoft Silverlight if you want to go to web pages that use it.
Microsoft Silverlight is a powerful tool for creating and delivering rich Internet applications and media experiences on the Web. Silverlight 5 builds on the foundation of Silverlight 4 for building business applications and premium media experiences. Silverlight 5 introduces more than 40 new features, including dramatic video quality and performance improvements as well as features that improve developer productivity.
Do streaming media pages requiring siiverlight , stream the media on windows phone 8?
i think there is not silverlight plugin for windows phone, but you can use silverlight platform to develop applications for windows phone.
Does Silverlight Matter to Windows Phone 8?
you can watch silverlight videos here
Internet Explorer 10 FAQ for IT Pros
Internet Explorer provides an add-on–free experience, so browser plugins don't load and dependent content isn't displayed. However, Internet Explorer for the desktop does support browser plugins, including ActiveX controls such as Adobe Flash and Microsoft Silverlight. See the IE blog, Browsing Without Plug-ins, for more information.