What does permissionless network or protocol mean?

A permissionless protocol, in the context of #blockchain and #cryptocurrencies, is a type of decentralized network protocol that allows anyone to participate without needing to seek permission from a central authority or comply with a set of predefined requirements.

In a permissionless blockchain, anyone can do the following

Join and participate in the network: They can download the protocol, verify transactions, and create new blocks if it's a Proof of Work (PoW) or Proof of Stake (PoS) system.

Execute smart contracts: In networks that support smart contracts, like #Ethereum, anyone can deploy and interact with them.

Transact with others: Anyone can send and receive tokens or interact with the #blockchain in other ways.