In the Graph Editor

You can view your animation curves within a forced-display value range of -1 to 1. The new curve normalization Graph Editor setting lets you scale down large key values or scale up small key values to fit within the -1 to 1 range.

Normalization will not change/hurt your animation, it is only a DISPLAY change in the graph editor. you can denormalize when your finished or whenever you want.

WHY USE NORMALIZATION? it make its easier to see/animate curves....when the curves are wildly different sizes (super tall peaks and super short/flat peaks) it's hard to adjust/animate all curves at once when the curve's display is so out of proportion from one another.

Curve normalization is useful when you want to view, compare, or edit animation curves that are related (such as rotation and translation curves), but have drastically different ranges. For example, with curve normalization you can compare all the translation and rotation animation curves for an object.

(below is an example of the same animation curves before and after normalization in the Graph Editor)

How to Normalize or Denormalize Curves?

Curves>Normalize/Denormalize, or simple click icon buttons in top right of GE (see below)

Limitations

Curve normalization does not work with the following types of curves:

-Rotation curves that use quaternion rotation interpolation
-Referenced animation curves
-Locked animation curves.