1. Pure culture: Contains only one species of bacteria. 2. Mixed culture: Contains more than one species of bacteria. 3. Contaminated culture: Contains unwanted bacteria or other microorganisms. 4. Axenic culture: Contains only one strain of bacteria. 5. Enriched culture: Contains nutrients that promote the growth of specific bacteria. 6. Selective culture: Contains substances that inhibit the growth of certain bacteria while allowing others to grow. 7. Differential culture: Contains substances that allow different species of bacteria to be distinguished based on their metabolic characteristics.