Force is a vector quantity because it has both magnitude and direction. When describing a force, we need to specify both how strong it is (its magnitude) and which way it is pushing or pulling (its direction). For example, if we say that a force of 10 newtons is pushing an object to the right, we have fully described the force by giving its magnitude (10 newtons) and its direction (to the right).

Scalar quantities, on the other hand, only have magnitude. For example, the temperature of a room is a scalar quantity because we only need to specify how hot it is (its magnitude), not the direction in which the heat is flowing.

The distinction between vector and scalar quantities is important in physics. Vector quantities can be added and subtracted using the rules of vector addition, while scalar quantities can be added and subtracted using the rules of ordinary arithmetic.