Geometry Cache parameter?

what is the exact function and some actual usecase of “Geometry Cache” parameter?

You press one of the red arrows and it will bake the sphere/box by replacing any past sphere/box baked.
2023-04-22 22_09_29-Window

The name is actually stored inside an User text
2023-04-22 22_11_22-Window

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Thank you @maje90.
What is the actual usecase for this parameter? what are the reasons that this parameter exist?