NDM-1 stands for New Delhi Metallo-beta-lactamase 1. It is a bacterial gene that confers resistance to a broad range of antibiotics, which makes the treatment of bacterial infections challenging. This gene gained notoriety for its ability to transfer antibiotic resistance between different types of bacteria, leading to the term 'superbug'. The presence of NDM-1 in bacteria is of great concern in the medical community because it limits the effectiveness of many antibiotics, making it difficult to treat infections. This discovery was particularly noted in bacteria from New Delhi, hence the name.