Distributed P2P network is a network in which different computers are connected to each other having same blockchain on each system.So if someone tries to attack or hack the blockchain it has to change the block and the block coming after it.
Let's say you hacked a system/pc and changed the entire blockchain after a block but the connected computers having same blockchain communicate with this attacked system and the majority of right chain stops the blockchain to get hacked.
In simple words to hack a blockchain a person needs to hack at least 50% of the computers/laptops to change the entire blockchain which is practically impossible because of the computational time taken for hacking and in this period the other systems corrected the chain (or the new validated blocks get added).
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