The Short Version
The IRRRL - Interest Rate Reduction Refinance Loan, also called the VA streamline - lets an existing VA borrower refinance to a lower rate with minimal documentation, no appraisal in most cases, and a reduced funding fee (0.50% vs. 2.15% on a purchase). It's the fastest and cheapest refinance product available in mortgage lending.
The IRRRL exists to reward veterans for using their benefit and to keep servicing costs low. It's not always the best option - a cash-out or conventional refi can win in specific situations - but for a pure rate-drop, IRRRL is almost always the answer.
Plain-English
No jargon, real examples
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VA Loans
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