Stamp duty is a tax payable to the Government based on the documents used in the transfer of property. (In other words, the conveyance document which transfers ownership to you). The value of the property (home or apartment, land or housing site) and your status (whether you are a first-time buyer, investor, etc.) will determine the amount of stamp duty that is payable.
The following links provide access to all the information you will need regarding Stamp Duty...