I looked on these things but didn't find good explanation about it there aren't no YouTube videos and the Roblox Developer website didn't gave me a good explanation about it so this is my last hope please tell me in simple way as possible.
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These are values represented by a Vector2 in pixels what the actual size/position/rotation of a GUI is. When a gui's size is sized by scale, AbsoluteSize represents the gui's size in offset. (will never be represented in scale)zadobyte692— 4y