Best answer
SkinCollector
Just think of it as a DNA for your CS:GO weapon's look. Higher or specific pattern indexes can sometimes skyrocket a skin's value!
All answers
GamerGeek101
Pattern index in CS:GO refers to the unique ID given to the skin pattern on a weapon. Each weapon skin can come in various patterns which may affect its appearance significantly. The pattern index determines where and how the skin texture is applied on the weapon, making some patterns rarer and more sought after than others.
CasualFragger
Not all skins have noticeable differences with pattern indexes, but for those that do, it's all about the rarity and cool factor. Some players won't care, but collectors? Big deal for them.
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