Cryptocurrency transactions can be validated by two ways: Proof of Work and Proof of Stake. Proof of Work is for mining and Proof of Stake is for Crypto Staking.
Mining is not energy efficient. Therefore, Crypto Staking came into existence in which cryptocurrency holders stake their bought coins to support the blockchain transaction validation process.
Staking is easily available via reputable cryptocurrency exchanges and if you own a hardware wallet like Ledger Nano then you can also stake using your hardware wallet app.
Crypto Staking is less risky but rewarding. In the staking crypto process, your investment will be locked up for a period, just like Bank Fixed Deposit.
Crypto Staking makes the blockchain network fast, cost-effective, and energy efficient. Instead of miners, people who participated in stake crypto receive rewards.
If you choose to stake crypto, your coins become part of that proof of stake process that helps to add a new block onto the blockchain in exchange for a reward.
Not all cryptocurrencies support proof of stake like Bitcoin only supports Proof of Work (Mining). Ethereum and Cardano support crypto staking.