Spoiled food refers to food that has deteriorated in quality and is no longer safe to eat. This can happen due to the growth of bacteria, mold, or yeast, which thrive in certain conditions, such as warmth and moisture. Signs of spoiled food include unpleasant odors, changes in color, and a slimy texture. Common causes of spoilage include improper storage, expiration dates, and contamination. Foods like dairy products, meat, and fruits are particularly susceptible to spoilage. To prevent food from spoiling, it is important to store it correctly and consume it before its expiration date.