India is a primary centre of egg plant (Solanum melongena L.) and having large genetic diversity. Brinjal is the most common popular and widely grown, vegetable crop of both tropic and sub -tropics of the world. Looking at the present situation, it is clear that we are not meeting the demand of food nutritional security. For improving productivity of brinjal, the genetic diversity is important as the individual plant selection is solely dependent on variation. To plan appropriate breeding programme and evolve high yielding cultivars with resistance to pest and diseases, the plant breeder must posses adequate knowledge on variability, genetic divergence, character association and the extent of contribution of each character to fruit yield. The book presents practical result of genetic variability, correlation, path co-efficient and diversity in brinjal which is very valuable for crop improvement through selection of parents in crossing programme. All basic aspects according to variability and it's importance have been briefly described in depth.