What is the difference between public and private Blockchains?

The question is about blockchain
Answer:

The difference between public and private Blockchains lies in their accessibility and control. Public Blockchains—Bitcoin and Ethereum, have open memberships allowing anyone to join the network and validate transactions, including deploying smart contracts. A Private Blockchain limits participation to a group, usually bounded within a single organization. This may encourage a span of control and elevated speed of transaction processing, but it compromises the very Decentralization and clarity characteristics attending Blockchains.

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