👉 *Basic Research* This is also known as pure, fundamental or even theoretical research. It is research for knowledge sake. There may not be any immediate need or application of the new knowledge thus produced; nor it is conducted for any immediate gain or problem solving. It may be done out to build a theory. Greatest research experiments and expeditions fall in this category of research. The five laws of library science by S. R. Ranganathan were formulated as a theoretical research.