This document summarizes the different types of rock folds, including their key parts and classifications. There are 11 types of folds described: anticline, syncline, symmetrical, asymmetrical, monocline, plunging, isocline, overturned, recumbent, zigzag, and dome folds. Folds occur when horizontal rock layers bend upward or downward due to compressive forces. They are classified as either anticlines, which bend upward, or synclines, which bend downward. Key parts of folds include the axis, axial plane, limbs, hinge line, and hinge zone.