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It's a separate testnet that copies over all the blocks and transaction traffic (posts, comments, votes, transfers, etc) from the mainnet.

Nothing on the mirrrornet is real (there's no economic value for tokens on the mirrornet), but it makes for a great environment for testing Hive nodes and Hive apps, because it is closely mirroring what is happening on the real network. Because it is a close copy to the real network, it allows us to detect potential bugs that we might not see with simpler testing methods and increases the chance for us to detect bugs that might occur on the real network once we deploy the new code.

The mirror i was thinking is is quite different in this regard. I think I grab now. Thanks for this short piece. Practically have zero knowledge about programming.

That's an explanation that I can get behind! Thanks <3