It is known that with PoS mining, normally wallets with a large number of coins have priority. However, not all users have an opportunity / desire to immediately acquire a large number of coins in order to increase the amount of compensation received. Some people are just exploring the coin, some do not have enough money to create a good stack and some want to expand their assets in different coins.
In all these cases, a solution, called pool, can help. With this form of mining, users combine their coins in one account, which participates in the mining. The awards received are fairly and regularly distributed among the participants in proportion to their contributions. The commission of the pool organizers compensates them for the organizational and technical expenses. Processes of payments and distribution of rewards are automated in favor of all the parties of the pool.