Bank accounts are designed for your daily spending, and come with a debit card to access your money at shops, ATMs and online. A savings account isn't designed to help you spend, but to help you save, so there's no debit card attached. Savings accounts pay interest on our balance each month, as an incentive to save, while bank accounts typically pay no interest.
It's not an either or situation: you can have both a savings account and a bank account (in fact it's encouraged that you do!).