Neon is a material, unlike others that give out a glowing effect on parts (or brighten parts if set on low detail less than 7). It does not work on parts with meshes, but it can be used on 
MeshParts.
Gallery
Example usage of the neon material, by asimo3089 
asimo3089 is a notable creator or influencer verified by Roblox Corporation. Learn more.
asimo3089 is a notable creator or influencer verified by Roblox Corporation. Learn more.