How we define runat="server"

hi,
i wanted to know the exact use of runat="server" which is being used
is ASP.NET
why we every time need to use it, even when i want to do the work at
client side? How to do simple processings like displaying some message
at client side only without hitting server?

what is the use of onclick, as we have to use onserverclick always?
why it is not possible to do the things without using runat="server"
in script?

what is the exact difference between coding at client-side and coding
at server-side?

In ASP.NET, there are two forms design form and code-behind form and
several controls.
what is the difference between HTML and webforms controls?
because we hav to include runat="server" while dealing with HTML
controls.

.

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