Three-dimensional (3D) shapes are solid objects that have length, width, and height. They are not flat like 2D shapes and can have flat or curved surfaces. The flat or curved parts are called faces, the lines where faces meet are called edges, and the corners where edges meet are called vertices. Examples of 3D shapes include a sphere (ball), cube (dice), cuboid (book), cone (ice cream cone), cylinder (can), pyramid (Egypt pyramids), and prism (tent). Each shape has its own parts like base, height, apex, or slant height. Learning about 3D shapes helps us understand the objects we see and use every day.