When we describe the state of an object, such as its mass, length and time, these quantities, we measure, completely determined by their magnitudes are called scalars.
Scalars are the quantities with no associated direction, such as mass (5 kg), length (3.4 m), time (30 s), temperature (20 °C),
When we describe the process of an action, such as displacement, force, velocity, acceleration, these quantities, we measure, determined by both magnitude and direction are called vectors.
Vectors are the quantities defined by both magnitude and direction, such as displacement (move to right 3 m), velocity (20 m s-1 to east), acceleration, force (20N forward), momentum, and impulse.
Geometrically, a vector that has a direction as well as a magnitude can be represented by an arrow:
Vector plus