BASAL METABOLIC RATE (BMR):
BMR is the number of calories your body needs to keep you alive at rest. This includes basic functions like breathing, circulating blood, regulating body temperature, and cell repair.
Think of it as the minimum energy your body burns even if you stay in bed all day.

TOTAL DAILY EXPENDITURE (TDEE):
TDEE is the total number of calories you burn in a day, including your BMR plus all activities walking, working, exercising, and even digestion.
Think of it as the total fuel your body uses to get through your day.