Stupid Question: What is a UV?

Development Rendering
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Hi all,

I know this probably seems like a really simple question, but it is so simple I can’t find an answer anywhere! What is a UV/ what are UV co-ords? I see them everywhere but understand nothing.

Also, just a side question, I made a static mesh in Blender and imported it into UE4. When I tried to apply a texture to it, the texture turned into a plain colour. Looking this up, I found it was something to do with UVs. Any ideas?

Thanks for your help.

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UV axes are used for texture mapping, they are assigning 3d polygons into 2d texture space.
You can make them by Unwrapping them.
Here’s what I found regarding Blender: Blender 3D: Noob to Pro/UV Map Basics - Wikibooks, open books for an open world