Original: There is no (human) leader in such a service, Quakers who worship in this tradition often believing that each person is equal before God and is capable of knowing "the light" directly. In many yearly meetings in Africa, Asia and parts of the US, worship is programmed.
Simplified: Quakers worship in "meetings for worship", and at other times these meetings also decide what Quakers should do - these meetings can be called "meetings for business", but other people call them "meetings for worship for business", because they include parts of both worship and business.