Meaning of Skewness:
The term skewness means lack of symmetry in a frequency distribution. Skewness denotes the degree of departure of a distribution from symmetry and reveals the direction of scatterness of the items. It gives us an idea about the shape of the frequency curve. When a distribution is not symmetrical , It is called a skewed distribution. Skewness tells us about the asymmetry of the frequency distribution.
Definition of Skewness:
 Skewness is the degree of asymmetry or departure from symmetry of a distribution  M. R. Speigal.
 When a series is not symmetrical , it is said to be asymmetrical or skewedCroxten and Cowden.
 By skewness of a frequency distribution , we mean degree of its departure from symmetrySimpson and kafka.
Skewness and frequency Distribution:
 Symmetrical Distribution:
In a symmetrical distribution or symmetrical curve , skewness is not present. The values of mean , median and mode coincide i.e. Mean=Meadian=Mode. The spread of the frequencies is the same on both sides of the central point curve.

Skewed Distribution:A distribution which is not symmetrical is called skewed distribution or asymmetrical distribution .A skewed distribution may be either positively skewed or negatively skewed.
 Positively skewed: If the longer tail of the frequency curve of distribution lies to the right of the central point, it is called a positively skewed distribution.In Positively skewed distribution , the value of the mean will be greater than median and median will be greater than mode.
 Negatively skewed.: If the longer tail of the frequency curve of the distribution lies to the left of the central point , it is called a negatively skewed distribution. In the negatively skewed distribution , the value of the mean will be less then median be less than mode.
 Positively skewed: If the longer tail of the frequency curve of distribution lies to the right of the central point, it is called a positively skewed distribution.In Positively skewed distribution , the value of the mean will be greater than median and median will be greater than mode.