What are the differences between public and private blockchains?

Public Blockchains:

-Open source and permissionless, meaning anyone can join the network without requiring approval from other members
-The validators of the blockchain are usually anonymous and distributed across the world
-Based on proof-of-work or proof-of-stake consensus mechanisms
-Generally more secure than private blockchains due to more participants

Private Blockchains:
-Restricted access, meaning only invited participants may join the network
-The validators of the blockchain are known, allowing for more accountability and a more structured network
-Consensus mechanisms are determined by the network administrators
-Less secure than public blockchains due to fewer participants