An ogive is a type of ARCH or curved line that is used in architecture and engineering. It is also known as a lancet ARCH, which is a pointed ARCH with two curves that meet at a sharp point. An ogive is often used as a decorative molding in buildings and other structures. It is also used to create a smooth transition between two surfaces, such as a wall and a ceiling. The term ogive comes from the French word for 'ARROWHEAD, ' which is a reference to its shape.