The use of SegWit has been around since the beginning of the Bitcoin scaling debate.
For the noobs on here, SegWit stands for Segregated Witness. It splits the transaction data and the consensus. This means that there is more space in a single block in the blockchain. This means faster transactions and lower costs.
It is claimed that SegWit enabled wallets reduce the transaction fees by as much as 50% – 70%
Here is a handy list of the Bitcoin wallets that support SegWit: