where it's at

where it's at  {adv. phr.},  {informal}
That which is important; that which is at the forefront of on-going social, personal, or scientific undertakings.
Young, talented and black, that's where it's at.
We send sophisticated machines to Mars instead of people, that's where it's at.
Categories: adverb informal
Source: A Dictionary of American Idioms

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