Junk food refers to food that is high in calories but low in nutritional value. It often contains excessive amounts of sugar, salt, and unhealthy fats. Common examples include fast food, sugary snacks, and processed foods. While they may be tasty and convenient, these foods can contribute to health issues like obesity and heart disease when consumed in excess. Many people enjoy junk food for its flavor and quick preparation. However, it is important to balance these foods with healthier options, such as fruits, vegetables, and whole grains. Making informed choices can help maintain overall health and well-being.