A high-interest savings account simply offers a more attractive interest rate than other savings accounts an institution might offer. The interest rate applies to the entire balance in your account and is calculated daily but paid monthly.

Your money grows faster with a high-interest rate paid on every dollar in your account – with no minimum balance required.

（https://www.manulifebank.ca/personal-banking/bank-accounts/high-interest-chequing-savings-account.html）