Here is an explanation for components that composes a shape of an object.
All objects in Metasequoia are composed by vertices(points), edges(lines) and faces.
A face is composed of multiple vertices.
A cube in the following image is composed of 6 quadrangles and 8 vertices. A sphere is made up with 40 triangles, 360 quadrangles and 382 vertices.
A complicated object like a violin is also composed of vertices, edges and faces.