Google Tag Manager - What is Usage and Benefits?

Hi,

I got email from Google Analytics to sign up for Google Tag manager.
I just sign up and following process to active for one of or site RS Seo Solution.

I am not getting exactly that what i can see here after few days. Is it like twitter trending Tags? or something else.

How can we utilize Google Tag Manager to promote our site? I and going to use this first time and so need tricks and suggestion to use this Google feature.

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