**Definition: **In physical science and engineering, a vector is geometric object which has both magnitude or length and direction. A vector is commonly represented by a line segment in a specific direction, indicated by an arrow. Vectors are typically used to describe physical quantities which have a directional quality in addition to a quantity that could be described by a single number with a unit.

**Also Known As: **Euclidean vector, spatial vector, geometric vector, mathematical vector

**Examples: **Velocity and force are vector quantities.