A vector is considered to be an element of a linear or vector space. A vector is different than a point, as it represents the displacement between two points, not the physical location of a point in space. Vectors also define a direction; points do not. Vectors are usually represented by a line segment in a specific direction on a graph, with an arrow at one end of the segment. They can also be represented in several ways, including bold letters in an equation, for example, vectors A and B, and with arrows above the vector, such as .