Segregated Witness, or SegWit, is a Bitcoin improvement proposal (BIP) that was created to address some of the scalability and performance issues of the Bitcoin network. It is a way of modifying the structure of Bitcoin transactions to allow for more efficient and secure processing. SegWit was activated on the Bitcoin network in August 2017, and it has since been adopted by many different wallets and other Bitcoin applications. SegWit changes the way that data is stored in a Bitcoin transaction, by separating the signature data from the rest of the transaction data. This allows for more efficient and secure processing of transactions, and it also enables new features, such as the Lightning Network and transaction malleability fix. SegWit is considered to be an important step forward for the Bitcoin network, as it increases the capacity and the efficiency of the network. Segwit Bitcoin addresses begin with 3 or bc1 and are recommended to use, refer to BIP49 and BIP48 standards to learn more.