What is the SSE or the error sum of squares?

I'm preparing for my exams, any one from you know about the SSE(error sum of squares).
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home alone!!
" The sum of the squared differences between the actual and predicted values of y. It is the portion of the SST that is not explained by the regression model."
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Sum of piazzas (ESS), instead referred to as the Style Sum of Piazzas or maybe Sum of Squares caused by Retroversion, is a quantity employed in describing just how effectively a new model, normally a regression type, signifies your data becoming modelled. We
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