In PoS blockchain networks, validators are responsible for confirming transactions and creating new blocks. Slashing helps maintain the integrity of the network by penalizing these validators for actions such as double-signing (validating two different blocks at the same time) or being offline for extended periods. When a validator is slashed, a portion of their staked tokens is confiscated and often redistributed to other validators or used to reward honest participants. This penalty mechanism is fundamental for deterring malicious behavior and ensuring network security.