Vertex

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A vertex is a single point in 3D space. Vertices are most often used in groups of three to form triangles. Each vertex can have several properties, such as a vertex normal, a color, texture coordinates, or other user-defined attributes.

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In geometry, a vertex (Latin: whirl, whirlpool; plural vertices) is a corner of a polygon (where two sides meet)
or of a polyhedron (where three or more faces and an equal number of edges meet).

In 3D computer graphics, a vertex is a point in 3D space with a particular location, usually given in terms of its x, y, and z coordinates. It is one of the fundamental structures in polygonal modelling: two vertices, taken together, can be used to define the endpoints of a line; three vertices can be used to define a planar triangle. Vertices are commonly confused with vectors because they can be described with the same properties. They are, however, two completely different things.

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