Practical byzantine fault tolerance is a model for reaching an agreement by allowing multiple computers to operate as if they were one, an approach known as state machine replication.
By communicating with one another, the nodes come to an agreement on a decision, such as the legitimacy of a block in a blockchain. With more trustworthy nodes present in the system, security improves. As long as the proportion of malicious nodes is less than one-third of the total, the honest nodes concur on the right option and reject the one that the malicious nodes suggest.
Energy-efficient pBFT systems don't require a lot of processing power or energy to run. Additionally, because all the nodes are constantly communicating with one another and don't require repeated confirmations, pBFT can reach a consensus quickly. As soon as all nodes concur on a decision, a transaction is considered complete.