The microgram is a unit of mass in the metric system, equivalent to one-millionth of a gram or one-thousandth of a milligram. It measures the weight of extremely small quantities, often used in fields such as chemistry, pharmacology, and biology. The symbol for microgram is µg, and it is a standard unit in scientific and medical contexts worldwide. Precise measurements in micrograms are crucial in practical applications, such as dosing medications, analyzing chemical compounds, and quantifying nutrients, ensuring accuracy and safety in various professional and industrial settings.