👉 In mathematics, a curve is defined as a smooth and continuous function that describes an object's path in space. Curves can be classified into two main types: straight lines and curved lines. Straight lines are curves that have no curvature or twisting at any point along their trajectory. They are the simplest examples of curves, since they are all straight and do not curve back towards themselves as they approach a point from opposite directions. Curved lines, on the other hand, have some degree of curvature.