Walkthrough refers to the final inspection of the home by the buyer before the closing.  The buyer will walk through the home to male sure the home is in the same condition as when the initial offer was submitted, and to make sure all repairs and terms of the contract have been met.  This walkthroug usually occurs a few days to the day before the closing.  If the property is not in satisfactory condition, the buyer usually asks the seller to fix things before the closing.