see a visual representation of exactly what you are buying or selling

know the exact property line dimensions, configuration, and the precise locations of all structures, driveways, fences, etc

know of any encroachments (driveway, fence, structure, etc)

be certain about easements such as utilities (drainage, sewer, power, water, etc) or egress / ingress

know the exact location of all trees and topography so that the future building / structure can be designed to fit the landscape accurately

know if any portion of the land is in a flood plain

go to closing with confidence, whether you are the buyer or seller