Basic Ik where is information about this

Development Getting Started & Setup
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Hello everyone,
I recently started learning about engines, but I’ve encountered a challenge. I’ve come across the concept of a basic IK node in numerous tutorials, yet I haven’t been able to find any information about it in the official documentation. Could someone please explain how people became aware of this node’s existence?

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You mean this https://youtu.be/xUy2eNQ6AB4
or https://youtu.be/dpteQzWMbfQ

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