A real estate appraisal is a service performed, by an appraiser, that develops an opinion of value based upon the highest and best use of real property. The highest and best use is that use which produces the highest possible value for the property. This use must be profitable and probable. Also of importance is the definition of the type of value being developed and this must be included in the appraisal, ie fair market value, condemnation value, quick sale value, etc.

There are several types and definitions of value sought by a real estate appraisal. Some of the most common are listed: