What is Segwit2X?

Segwit2X is a proposed hard fork of the Bitcoin blockchain that was scheduled to take place in November 2017. The proposal was for a two-part fork of the Bitcoin blockchain, with the first part consisting of a soft fork to activate Segregated Witness (SegWit). The second part would have been a hard fork to increase the block size from 1MB to 2MB. The hard fork was intended to help alleviate the scaling issues that Bitcoin was experiencing at the time. SegWit2X was initially supported by a large majority of the Bitcoin community, but by the time of the proposed date, the support had dwindled significantly. This ultimately led to the plan being called off.