In science and mathematics any quantity that has magnitude but lacks direction is referred to as a scalar quantity. Hence a Scalar quantity has no direction but has a sign and magnitude. It is distinct from Vector quantity which has both magnitude and direction. In Physics it refers to any physical quantity that one number can describe completely. Examples of Scalar quantities are length, area, speed, vague, density, mass, temperature, energy, pressure, work, entropy and power. Vector quantities on the other hand include displacement, velocity, direction, force, momentum, weight, drag, thrust, acceleration and lift. Scalar quantities are simpler to compare as they have just magnitude to compare. This makes dealing with scalar quantities easier to deal with and calculate.
