What's the name and how it works the black&white bar?

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pupaz
Hi everyone! I would like to know the side bar name in the match analysis. How advantage has the white player if the bar is +4 white? What the difference if the bar show +2? Thank you!
ArtNJ

+1 is an advantage worth one pawn for white; -1 is an advantage for black worth one pawn.  So +4 would be an advantage for white worth 4 pawns give or take.  

In practical terms, if material is equal and the engine is showing an advantage of much over a pawn for one side there is probably some tactical thing you are missing.  An advantage of less than a pawn is likely to be some positional or at least activity related thing you are missing.