Question

What is a direction vector?

Answer 1

The direction of a vector is the direction along which it acts.
It has a certain magnitude.

For example, we say 10 N force in the east.
Here, 10 N is the magnitude and towards the east is the direction.

The direction is specified using a unit vector.
Let n be a unit vector along a certain direction and `A` be some scalar, then a vector with magnitude that of `A` and direction that of n is defined as,

A = `A` n