What's the difference between a server and a shard?

And for now, for this very first version, there's not a difference between both because we still run one server per shard. We separate those two words because eventually, the shard will be much larger than just one server. Once we get to server meshing, which will be in later iterations, that's when we have multiple servers per shard. But in this very first iteration, as you said, we basically took the foundation of the engine and we replaced it with this new persistent entity database. We try to get at par with what's there, right? So that means we basically take all the tech we already have, one server per shard, and we replace that with persistent entity streaming.