What is Permissionless Ledger (Permissionless Blockchain)?

A permissionless ledger or permissionless blockchain is a decentralized network that can be used without obtaining permission from a centralized authority or any other entity. Permissionless ledgers are typically constructed in an open and decentralized manner employing the use of their own cryptocurrency. Permissionless networks operate in a peer-to-peer (P2P) manner and are generally considered open, public, borderless, neutral, censorship-resistant, transparent, and immutable. Permissionless blockchains are the opposite permissioned blockchains whereby users must have special permission to use the network.