"선교사" (missionary) refers to individuals who are sent to promote their religious beliefs, often in foreign countries. They typically work to spread the teachings of their faith, provide education, and offer humanitarian aid. Missionaries can belong to various religious organizations, including Christianity, Buddhism, and Islam. In addition to spiritual guidance, missionaries often engage in community development projects. These may include building schools, hospitals, and providing resources for local populations. Their work aims to improve the quality of life while sharing their beliefs, fostering cultural exchange, and promoting understanding among different communities.