SegWit, or Segregated Witness, is the name given to a Bitcoin protocol upgrade, which was implemented on August 23rd, 2017. This soft fork fixed an issue called transaction malleability, which enabled BTC transaction data to be changed before the network processed these transactions. By allowing signature (i.e., “witness”) information to be stored outside of (i.e., “segregated” from) a block of relevant transactions yet still verify them, SegWit allows Bitcoin to keep the integrity of transactions while also packing more of them into any single 1 megabyte block. This resulted in a faster and safer Bitcoin.