Prevotella is a genus of Gram-negative, anaerobic bacteria that are a common part of the human oral, gut, and vaginal microbiomes. They are involved in both health and disease, playing a role in conditions like periodontitis and bacterial vaginosis. Genomic DNA from Prevotella is utilized to understand its role in the human microbiome, particularly in diseases. It's used for microbiome sequencing studies and for developing diagnostic tools to detect its presence and abundance.