Weights and measures refer to the systems used to quantify physical properties such as mass, length, and volume. These systems ensure consistency and accuracy in trade, science, and daily life. Common units include grams, kilograms, meters, and liters, which help people understand and compare quantities. Standardization of weights and measures is crucial for global commerce and communication. Organizations like the International System of Units (SI) provide guidelines to ensure that measurements are uniform across different regions and industries. This standardization helps prevent confusion and promotes fairness in transactions and scientific research.