Streptococcus bacteria are a group of spherical-shaped bacteria that can be found in various environments, including the human body. They are known for their role in causing infections, such as strep throat, skin infections, and pneumonia. These bacteria are classified into different groups based on their characteristics and the diseases they cause. Some types of Streptococcus are beneficial and play a role in maintaining a healthy balance of bacteria in the mouth and gut. However, pathogenic strains can lead to serious health issues if not treated properly. Understanding these bacteria is important for effective diagnosis and treatment of infections.