Texture quality is generally representative of the actual resolution (in pixels) of textures mapped to objects. Higher resolution textures result in significantly deeper details, but are also abusive on VRAM and video processing hardware. For instance, 4K & 8K texture packs exist as mods for Skyrim, each adding far more detail to objects (like wood grain, dirt and grit, etc.); such texture packs are also a massive drain on system resources and should be used sparingly.
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