A savings account is an account you open with a bank or credit union, where the bank holds your money for you. In exchange for giving your money to the bank to hold (and use while they are holding it) the bank will pay you interest. You always maintain access to your money but if you keep a low balance in your savings account, you will probably not earn much in interest.
Savings accounts are good accounts to have as they allow you to set aside money that you don’t use/need day to day and can keep that money separate from any other accounts you use to pay your recurring expenses. The interest you will earn can be nominal, the real value in having a savings account is the discipline you develop to set aside money for use one day on a large purchase, emergency expense or just to know there’s a financial cushion should your income suddenly change.