Internal temperature refers to the temperature inside a living organism, which is crucial for maintaining proper physiological functions. In humans, the normal internal temperature typically ranges from 98.6°F (37°C) but can vary slightly based on factors like time of day, activity level, and individual differences. Monitoring internal temperature is essential in various fields, including medicine and food safety. For instance, in healthcare, a fever may indicate an infection, while in cooking, ensuring that food reaches a safe internal temperature helps prevent foodborne illnesses.