Early human being lived on trees and in caves. When they started to grow crops it became necessary to have a permanent home. So Settlement grew near the river valleys as the water was available and the land was fertile. And With the development of trade, commerce and manufacturing. Settlement is more stable.
Settlement-Two types Temporary or permanent.
The people living in deep forests, hot and cold desserts, mountains often dwell in such temporary settlement. People lived a place for a very short time called temporary settlement. In these people live for a special purpose. People lived in a fixed place called permanent settlement.