Missionaries are a group of people who preach the Christian gospel. So many believers are saved in China today because many overseas missionaries such as Hudson Taylor and others came to China to preach. This is what we are today. Great results.
When the gospel is preached to people, people believe in the Lord and accept Christ as their savior, and are reborn and saved, but they are still little babies in spirit. At this time, they need the help of church pastors. Pastoral care and teaching help newly saved people grow spiritually. This is why after people believe in the Lord, they must go to church to fellowship and grow with brothers and sisters.
Missionaries and Pastors are people used by God. Missionaries mainly preach the gospel, while pastors mainly pastor the church.