Heat removal from a CPU

I was playing around with my PC today 🧐, and I noticed a big block of metal (having slots) between the CPU fan and the processor. I have a feeling it has something to do with heat removal but I am not quite sure 😥. Can anyone explain what it is and why it is placed there?
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btw if you want more information on this then do check out these courses on heat transfer
Heat Transfer in Structures - ANSYS Innovation Courses
https://courses.ansys.com/index.php/courses/heat-transfer-learning-track/BTW guys, I also found this awesome simulation example related to this topic -
Simulation Example - Cooling Electronics using a Heat Sink - ANSYS Innovation Courses
https://courses.ansys.com/index.php/courses/governing-equations-of-fluid-dynamics/lessons/simulation-examples-homework-and-quizzes-governing-equations/topic/simulation-example-cooling-electronics-using-a-heat-sink/