The solution approach of Plasma is extremely "pragmatic construction". It does not intend to transform the only cash register but instead directly opened a large "new market" with countless self-checkout lanes next to it. This new market is the Plasma subchain. Technically, there are two key points for achieving concurrent processing. First, it has a sharded architecture. Plasma is not a single $XPL @Plasma #Plasma chain, but a tree structure composed of many subchains. Your transactions and my transactions, if they occur on different subchains, or on the same subchain but are not related, can be processed in parallel in their respective spaces without interference. It's like me buying water at convenience store A while you buy bread at convenience store B; we can check out simultaneously without any conflict.