'DefaultTerrainMaterial' purpose?

I don’t see any built-in layer/splatmap-support terrain material inside engine, so thought that I need to create all terrain shader(material) nodes from scratch to make use of splatmap/layers mentioned in document.

But there is a few ‘terrain’ named material and instances inside installations. ‘DefaultTerrainMaterial’, ‘Highlight Terrain Material’, and just ‘Terrain’. All of them are just plain white material and does nothing with texture or parameters, so I am curious what are they and why they exist.

Default material is just to ensure that terrain can be displayed when the user didn’t provide their own material. It’s rather common way to create own materials with custom layering and stuff. Depending on game needs.

Understood. is there some differences between those three?