Customdata Layers

Can someone explain what is this new operation in blender called customdata layers and how to use them?

Thanks

Assuming that you are referring to http://wiki.blender.org/index.php/Dev:Source/Architecture/Custom_Element_Data

sigh…
… we have yet another (incompatible) meaning for the word “Layer” in Blender.

Awesome! Everything will be called “layer” before the end of the year :wink: