Your property's value is what a ready, willing and able buyer would pay. To determine that value, it is necessary to look at comparable properties in the neighborhood which sold recently. When calculating your home's value, consider your property the “subject property” and the sold properties “comparable properties.
A home appraisal is an unbiased estimate of the true (or fair market) value of what a home is worth. All lenders order an appraisal during the mortgage loan process so that there is an objective way to assess the home's market value and ensure that the amount of money requested by the borrower is appropriate.