How did domestication of plants and animals lead to the development of towns?

At first early human beings had to rely on hunting and gathering in order to survive.  During this period they were able to identify some plants that can be edible.  They were also able to learn how to use traps to capture animals.  Through their hunting and gathering, they eventually learned how to plant and how to gather animals and raise them in one spot.  In time, they were able to raise enough plants and animals for their needs that some of these early humans can now settle in one area rather than roam the land in search of food.  Eventually these small groups would grow in number and from a small family, you now have large population living in one place and that is how towns began.