As an intermediate step between soft fork and hard fork, what is a software upgrade that can run multiple versions compatiblely?

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In this guide, you’ll learn the answer to “As an intermediate step between soft fork and hard fork, what is a software upgrade that can run multiple versions compatiblely?” in OverWallet.

Question: As an intermediate step between soft fork and hard fork, what is a software upgrade that can run multiple versions compatiblely?

Answer: Velvet fork.

Further reading

What is a fork that is compatible with previous chains with only a partial upgrade of features, so node client updates are not required?

What is a fork that is incompatible with the previous chain due to a protocol upgrade, etc., so the node client must be updated?

What do we call a new branch of the chain being created due to a software upgrade, attack, network delay?