LB Broth, or Luria-Bertani broth, is a nutrient-rich liquid medium commonly used in microbiology for the growth of bacteria. It contains ingredients like tryptone, yeast extract, and sodium chloride, which provide essential nutrients for bacterial cells to thrive. This broth is particularly popular for cultivating Escherichia coli (E. coli) and other laboratory strains, making it a staple in genetic engineering and molecular biology research. LB Broth can be used in various applications, including plasmid isolation and protein expression studies, due to its ability to support high-density bacterial growth.