How Do Replace-by-Fee (RBF) Mechanisms Help Users on a Congested Network?

RBF allows a sender to replace an unconfirmed transaction in the mempool with a new version that pays a higher fee. On a congested network, the original transaction may be stuck due to low fees.

By using RBF, the sender signals to miners that they should discard the old transaction and include the new, more profitable one. This is a crucial tool for users to manage confirmation times and avoid indefinite delays.