Disease-resistant plant varieties are specially bred or selected plants that can withstand specific diseases caused by pathogens like bacteria, fungi, and viruses. These plants have natural defenses that help them resist infections, reducing the need for chemical treatments and improving crop yields. Farmers often choose disease-resistant varieties to ensure healthier crops and sustainable farming practices. By using these plants, they can minimize losses due to disease outbreaks, which is crucial for food security. Examples of such varieties include disease-resistant wheat and blight-resistant potatoes, which have been developed through traditional breeding or genetic engineering.