Permissioned vs Permissionless Blockchains: What's The Difference?

If you are new to blockchain you are bound to come across many unfamiliar blockchain specific technical terms.  Some of these terms are easier to understand than others. 

Most newcomers are likely to be confused about the difference between 'permissioned blockchain' and 'permissionless blockchain.' 

The author of this shared article explains the differences very lucidly. 

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