The term metabolic rate refers to the rate at which the body expends energy or burns calories. This encompasses two primary components: the basal metabolic rate (BMR), which is the energy needed for essential bodily functions at rest, and the total daily energy expenditure (TDEE), which includes energy used during physical activities and digestion. Factors influencing metabolic rate include age, gender, muscle mass, and activity level. Understanding metabolic rate is essential for managing weight and tailoring nutrition and exercise plans effectively.