Expalining the fast retransmit

What do you mean by the fast retransmit? Explain in detail.

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The  gap  within  the  packet  stream  is  not  because of the  severe  congestion,  however  a  simple packet  loss  because of the  transmission  error. The sender may now retransmit the missing packet before timer get expires. This behavior is known as the fast retransmit.

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