What's the difference between account balance and available funds?

i'm a little bit confused about the difference between account balance and available funds in my Commonwealth netbanking





account balance: $213.41


available funds : $152.67|||Your balance is the total amount currently in the account but the available funds is the amount you can access (withdraw). Likely there is an item being deposited or withdrawn that represents the difference between the two...either a check is coming in that the bank won't let you take money out against yet or a check or other charge is being processed for which your bank has already reserved the money to pay. You should contact your bank for account details to see what is pending.