A gram is a unit of mass in the metric system, commonly used to measure small quantities of substances. It is defined as one-thousandth of a kilogram, which is the base unit of mass in the International System of Units (SI). The symbol for gram is g. Grams are widely used in cooking, science, and nutrition to quantify ingredients and food portions. For example, a standard serving of sugar might be measured in grams to ensure accurate recipes and dietary guidelines. Understanding grams helps in precise measurements for various applications, from baking to laboratory experiments.