E. coli, or Escherichia coli, is a type of bacteria commonly found in the intestines of humans and animals. Most strains are harmless and play a vital role in digestion, but some can cause serious foodborne illnesses. These harmful strains can lead to symptoms like diarrhea, abdominal pain, and vomiting. E. coli infections often occur through contaminated food or water, particularly undercooked meat, unpasteurized milk, and raw vegetables. To prevent infection, it is essential to practice good hygiene, cook food thoroughly, and wash hands regularly, especially after handling raw meat or using the restroom.