Final answer:
Scalars have only magnitude, while vectors have both magnitude and direction.
Step-by-step explanation:
A scalar is a physical quantity with magnitude only. Examples of scalar quantities include temperature, mass, and time. On the other hand, a vector is a physical quantity with both magnitude and direction. Examples of vector quantities include displacement, velocity, and force.
Vectors may be represented as arrows where the length of the arrow indicates the magnitude and the arrowhead indicates the direction of the vector. For example, if you have a vector representing a velocity of 20 m/s due north, you would draw an arrow pointing north with a length of 20 units.