"Curved" refers to a shape that is not straight but instead bends or arcs. This can be seen in various objects, such as a circle, which is perfectly round, or a curve in a road that changes direction. Curved lines can be found in nature, like the shape of a rainbow or the outline of a leaf. In mathematics, curves are studied in geometry and can be represented by equations. For example, a parabola is a specific type of curve that has a U-shape. Curved surfaces, like those of a sphere or a cylinder, also play important roles in fields such as engineering and design.