The component of utmost importance in every distributed ledger system is the consensus model applied in it. Consensus models are the backbone of a blockchain, allowing its users to interact with each other without any other mechanisms providing trust.
Practical Byzantine Fault Tolerance is one of the major consensus models. It allows a distributed computer network to function correctly even if some nodes in the network fail or try to propagate incorrect information to other nodes.
Blockonomi has tackled the task of compiling the most important facts about this consensus model in the article, written in simple terms and easy to understand.
Definitely recommended, not only for complete beginners.
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You may also refer to good old Wikipedia for more details about PBFT: