Enterococci are a type of bacteria commonly found in the intestines of humans and animals. They play a role in the digestive process and are usually harmless. However, some strains can cause infections, particularly in people with weakened immune systems. These bacteria are known for their ability to survive in harsh environments, including high salt concentrations and extreme temperatures. Enterococci can be resistant to many antibiotics, making infections difficult to treat. They are often associated with hospital-acquired infections, particularly in surgical wounds and urinary tract infections.