What is meant by pruning and enrichment?

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SUMMARY

Pruning in the context of the PERM (Pruned Enriched Rosenbluth Method) algorithm refers to the process of deleting certain elements, specifically polymer chains or beads within those chains. Enrichment involves enhancing the weights of either entire polymer chains or individual beads. The discussion raises questions about the specifics of what is being pruned and how the weights are modified, prompting a reference to Grassberger's original article for further clarification.

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user366312
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TL;DR
What does it mean by pruning and enrichment in the case of Rosenbluth method?
As far as I understand:

  1. Pruning means deleting something.
  2. Enrich means to enhance/increase weight.
Now my question is, in the case of the PERM algorithm,

  1. Are we deleting some polymers chains? Or, are we deleting some beads in all polymer chains?
  2. Are we increasing the weights of some polymers? Or, are we increasing the weights of some beads/atoms of all polymers?
When we are modifying the pruned weights, what are we replacing them with?
 
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