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Surface modeling is a technique used in computer-aided design (CAD) to represent the surface geometry of three-dimensional (3D) objects. Surface models represent the shape and appearance of an object's surface, but do not include the object's internal structure or solidity. Surface modeling is often used to create 3D models of objects with complex shapes and surfaces, such as organic shapes and freeform curves. It is typically used in conjunction with other CAD techniques, such as solid modeling, to create more detailed and accurate models. Surface modeling is widely used in a variety of industries, including automotive, aerospace, architecture, and product design. It is an important tool for creating detailed and accurate 3D models of objects with complex shapes and surfaces. There are several different approaches to surface modeling, each with its own advantages and limitations. Some of the most common surface modeling techniques include: