I. Meaning of Pure Science: Chase of unmixed science is called pure science. It is a clear compartment of science. It has the quality of being pure. It is essentially concerned with human interest or for human welfare. Mainly it is concerned with acquiring knowledge about the working of society or of a branch of knowledge or discipline and leads a philosophical dialogue on it.

II. Meaning of Applied Science: Putting knowledge to use is called applied science. For example, social work is concerned with the 'technology of application' of ideas for improving the human lot. The relation between sociology and social work is like the relation between a 'pure science' (just acquiring knowledge) as 'applied science' (is just application of knowledge in a practical field or life).

Social work is concerned with the 'technology of application' of ideas for improving the human lot.

In the early twentieth century, it was realized that social scientists were mainly concerned with acquiring (or getting) knowledge about the working of society and leading a philosophical dialogue on it. 

The question of the ideal society also figured in some countries of the western world, but which technology should be adopted for building it up was not given a serious thought.

Knowledge is of no importance unless it is put to use. Social work is a product of this background. It charts out the suitable knowledge for human upliftment.