the Proof of Stake (PoS) algorithm that is one of many new cryptocurrencies algorithm and people called them as staking. staking involves the purchase of cryptocoins and holding them in a wallet for a particular period of time. This is akin to a fixed deposit in the non-digital currency sphere. Similar to a fixed deposit which rewards you with a defined interest at the end of the period as stipulated in the contract, Proof of stake also rewards you with additional coins. By holding coins in your wallet, you are rewarded for supporting the network. Therefore, the more coin you have, the more reward you will get too. Its difference with mining. Mining requires technical know-how as well as computational power so as to solve the algorithmic puzzles involved in blockchain networks. Beside that Mining need you to buy machine, like ASICS or high-end GPUs to mining your coins and it will cost you more electrical cost than staking for itself