Three-dimensional objects are solid figures that have length, width, and height, giving them depth and volume. Unlike flat, two-dimensional shapes, 3D objects can be physically touched and occupy space. They are made up of faces (flat or curved surfaces), edges (where two faces meet), and vertices (corners where edges meet). Common examples include cubes, cuboids, spheres, cylinders, cones, and pyramids. These shapes are found all around us — from a football (sphere) and a can (cylinder) to a box (cuboid) and an ice cream cone (cone). Understanding their properties helps in fields like architecture, engineering, packaging design, and everyday problem-solving.