Compulsory service refers to a system where individuals are required by law to serve in a specific capacity, often in the military or community service. This practice is implemented to ensure that all eligible citizens contribute to national defense or social welfare, promoting a sense of duty and responsibility among the population. Countries may have different rules regarding compulsory service, including the duration and age of eligibility. For example, in some nations, young adults must complete a period of service, while others may offer alternatives like civil service. This system can help address labor shortages and foster civic engagement.