SegWit: An optimization proposed by Bitcoin Core developer Pieter Wuille at the end of 2015, SegWit increases the volume of transactions that fit into each block without raising the block size parameter. Specifically, it also removes transaction malleability, an issue that once resolved could lead to a number of network improvements.
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Yes, SegWit was implemented as a soft fork recently, now this new segwit2x is mostly rejected by the Core dev team.