What is Basic Research?

Legal Definition
Basic research, also called pure research or fundamental research, is scientific research aimed to improve scientific theories for improved understanding or prediction of natural or other phenomena. Applied research, in turn, uses scientific theories to develop technology or techniques to intervene and alter natural or other phenomena. Though often driven by curiosity, basic research fuels applied science's innovations. The two aims are often coordinated in research and development.

Although many discoveries have been serendipitous, discovery science specifically seeks discoveries, and, along with theoretical science and experimental science, is now key to basic research and is sometimes expressly planned.
-- Wikipedia
Legal Definition
Any investigation on a subject to understand it and make a specific outcome.