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# Vector

A vector describes a unit which has both magnitude and direction. The most common notations for vectors are to put an arrow over a letter or to make the letter bold.
Graphically, a vector is usually represented by an arrow where the length of the arrow represents the magnitude and the arrowhead represents its direction.
Vectors are drawn between two points, the initial point and the terminal point. For example, if a vector is drawn between and it can be named or depending on the initial point and terminal point. The part of the vector that lies on the initial point is called the tail of the vector, and the part that lies on the terminal point is the tip.

A vector can also be written in component form. In two dimensions, this is Here, the first coordinate is the horizontal change and the second coordinate is the vertical change.

In the case of a vector in a three-dimensional space, the component form is Here, the coordinates represent the change in the direction of their corresponding axes.