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Following is the difference between key point and hard point: Keypoint: When building your model from the bottom up, you begin by defining the lowest-order solid model entities, keypoints. Keypoints are defined within the currently active coordinate system. You can then define lines, areas, and volumes connecting these keypoints. Hardpoint: Hard points are actually a special type of keypoints. You can use hard points to apply loads or obtain data from arbitrary points on lines and areas within your model. Hard points do not modify either the geometry or topology of your model.