The Church is the Body of Christ. The word church comes from the Greek word, ekklesia. It means to call out from. Another Greek word associated with the Church is kuriakon. It means that which belongs to the Lord. The Church is a group of people who belong to the Lord, called out of the world.
Jesus founded the Church and He is the head of it. He promised the founding of the Church in Matthew 16:181. “And I also say to you that you are Peter, and on this rock I will build My church and the gates of Hades shall not prevail against it.” The following Scriptures show that Jesus is the head of the Church: “And He put all things under His feet and gave Him to be the head over all things to the Church which is His body, the fullness of Him who fills all in all.” Ephesians 1:22,231 “But speaking the truth in love, may grow up in all things into Him who is the head – Christ from whom the whole body, joined and knit together by what every joint supplies according to the effective working by which every part does its share, causes growth of the body for the edifying of itself in love.” Ephesians 4:15,161 “And He is the head of the body, the Church, who is the beginning, the firstborn from the dead, that in all things He may have the preeminence.” Colossians 1:181
Jesus built the Church on the foundation of the apostles and prophets with Himself as cornerstone. (Ephesians 2:20) This means Jesus built the Church through the work of the apostles and prophets as the Holy Ghost operated through them. (Acts 1:8)