MUAC tape, or mid-upper arm circumference tape, is a simple, color-coded measuring tape used to assess malnutrition in children and adults. It's a crucial tool for quick malnutrition screening in community and hospital settings, particularly in emergency situations. The tape is wrapped around the mid-point of the upper arm, and the color displayed indicates the nutritional status, with red often signifying severe acute malnutrition, yellow for moderate malnutrition, and green for normal or healthy.