Body temperature is a measure of how hot or cold the human body is, typically maintained around 98.6°F (37°C). It can vary slightly from person to person and can change throughout the day due to factors like activity level, time of day, and overall health. The body regulates its temperature through processes like sweating and shivering. When the body gets too hot, it sweats to cool down, while shivering helps generate heat when it's cold. Abnormal body temperatures can indicate health issues, such as fever or hypothermia, and may require medical attention.