A real estate appraiser is someone who estimates the value of real estate professionally. An appraisal estimates the market value of a property as of a specific date. The accuracy of an appraisal depends on factors like the competence and integrity of the appraiser, as well as the availability of pertinent data. Appraisals are used for purposes like obtaining loans, insurance, taxes, and determining just compensation for eminent domain. The three main approaches to valuation in an appraisal are the cost approach, income approach, and market data approach.