With proof of stake, a staker eventually gets an opportunity to follow the validation rules and put some transactions in a block. If they don't properly follow the rules, they will get slashed. If they don't submit a block when it is their turn, they will get gently slashed.
In proof of work it is a free-for-all with whoever has the most hashing power winning block submission more frequently. If they submit a block that doesn't follow the validation rules they keep all of their (physical silicon) hashing power and the block is ignored.
With proof of stake, a staker eventually gets an opportunity to follow the validation rules and put some transactions in a block. If they don't properly follow the rules, they will get slashed. If they don't submit a block when it is their turn, they will get gently slashed.
In proof of work it is a free-for-all with whoever has the most hashing power winning block submission more frequently. If they submit a block that doesn't follow the validation rules they keep all of their (physical silicon) hashing power and the block is ignored.