In one sentence
The handoff of servicing rights and records from one servicer to another, governed by notice requirements and a data and document exchange.
The longer version
Transfers move the payment relationship and the loan file to a new servicer. Regulations require borrower notice, and the operational risk is the file: incomplete or mis-boarded data creates disputes and compliance findings.
A transfer is only as clean as the record being handed over, which is why organized, complete loan files matter far beyond the closing they document.
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