Crop diversity refers to the variety of different species or genetic varieties of crops that are cultivated by farmers. This diversity is important for a number of reasons, including ensuring food security, protecting against pests and diseases, and adapting to changing environmental conditions. Crop diversity can also help to preserve traditional or indigenous varieties of plants and promote sustainable farming practices. Researchers in this area study ways to promote and maintain crop diversity, such as through seed banks, breeding programs, and conservation efforts.