Is staked ETH locked?

Could you please clarify for me whether staked ETH is indeed locked? I've been hearing a lot about staking as a way to earn rewards on my Ethereum holdings, but I'm still a bit hazy on the specifics. Is staking ETH a process that results in the tokens being locked and unavailable for trading or other uses until a certain condition is met, such as a specified staking period expiring? Or is staking ETH merely a commitment to support the network's operations, without actually locking the tokens? I'd appreciate it if you could provide some clarity on this matter. Thank you.