I recently listened to people talk about "data availability / ordering / finality" for the third time, and at first I was confused by the terminology... But then I thought, just follow a thread: think of the chain as a system of "posting + queuing + stamping." DA is whether others can truly download the content you posted (otherwise they only see the title without the main text), ordering is about making sure who comes first and who comes later isn't secretly inserted, and finality is about when this record is considered "stamped and unchangeable." Modularization and DA layer storytelling are exciting for developers right now, but it's normal for users to be confused. I’ll just focus on this: when problems happen, can I retrieve evidence? Can I exit? Instead of just hearing a bunch of new terms.