1 . Descriptive Statistics :-
It deals with the numerical data. These data represents observations obtained through appropriate measurement process. They may define to entire population or universe that is derived through proper sampling procedure .
Descriptive statistics include the techniques such as collection and tabulation of data, measurement of central tendency , measurement of dispersion, index number , skewness which help to summarise and describe the main features of data .

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2. Applied Statistics :-
Applied statistics give desired information using some statistical tools which represent the whole poplation .
In other words, this division of statistics is concerned with the application of appropriate statistical methods and techniques to the specific problems . Important techniques which constitute the applied statistics are techniques of sampling , statistical quality control, quantitative techniques for business decisions, index number , forecasting tools and etc .

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3 . Inferential Statistics :-
Inferential statistics use a random sample of data taken from a population to describe and make inferences about the population using some tools like t - test, z - test, chi-square test and etc .
In other words, in inferential statistics we can know about population statistics (parameter) using statistics calculated in the sample (statistic) through applying appropriate statistical tools.