Bacterial strains are specific types or variations of bacteria that can be distinguished based on genetic, biochemical, and physiological characteristics. These strains may have unique properties such as antibiotic resistance, pathogenicity, or the ability to produce specific compounds. Studying bacterial strains is important for understanding their role in various processes such as human health, environmental degradation, and industrial applications. Researchers often isolate and characterize bacterial strains to identify their potential uses or risks. Additionally, bacterial strains are commonly used in research to study basic biological processes or develop new biotechnological applications.