When I add various materials to my 3D items, it brings them to life, making them more realistic and visually appealing. Luckily, in the Unreal Engine, all it takes is a straightforward drag and drop process to accomplish this. As you can see in the accompanying illustration, the difference between a 3D item without any material and the same item with material is significant. The added textures, colors, and other details enhance the overall look and feel of the object, creating a more immersive experience for the viewer.
https://dev.epicgames.com/community/learning/tutorials/dL85/unreal-engine-material-application