The Bt-brinjal is a genetically modified form of the traditional brinjal.

The 'Bt' in Bt-brinjal stands for Bacillus thuringiensis, a bacterium that naturally produces a toxin that is harmful to certain pests. The gene from this bacterium is inserted into the brinjal, making it resistant to certain pests.

This modification does not aim to improve its taste, make it drought-resistant, or extend its shelf-life. Therefore, the primary objective of developing Bt-brinjal is to make it pest-resistant.