A Euclidean vector (sometimes called a geometric or spatial vector, or—as here—simply a vector) is a geometric object that has magnitude (or length) and direction and can be added to other vectors according to vector algebra.
A Euclidean vector is frequently represented by a line segment with a definite direction, or graphically as an arrow, connecting an initial point A with a terminal point B, and denoted by

Vectors play an important role in physics: velocity and acceleration of a moving object and forces acting on it are all described by vectors. Many other physical quantities can be usefully thought of as vectors. The mathematical representation of a physical vector depends on the coordinate system used to describe it. Other vector-like objects that describe physical quantities and transform in a similar way under changes of the coordinate system include pseudovectors and tensors.

In the Cartesian coordinate system, a vector can be represented by identifying the coordinates of its initial and terminal point .
For instance, in three dimensions, the points A = (1,0,0) and B = (0,1,0) in space determine the free vector *O* = (0,0,0).
Thus the bound vector represented by (1,0,0) is a vector of unit length pointing from the origin along the positive *x*-axis.
The coordinate representation of vectors allows the algebraic features of vectors to be expressed in a convenient numerical fashion.
For example, the sum of the vectors (1,2,3) and (−2,0,4) is the vector