Clostridia are a group of bacteria that are commonly found in soil, water, and the intestines of animals and humans. They are known for their ability to form spores, which allows them to survive in harsh environments. Some species of Clostridia can cause serious infections, such as tetanus and botulism, while others play a role in breaking down organic matter in the environment. These bacteria are anaerobic, meaning they thrive in low-oxygen conditions. While some Clostridia can be harmful, others are beneficial and are used in processes like fermentation. Understanding Clostridia is important for both health and environmental science.