A Settlement is defined as a place where people live. SUsesement can come in different sizes. A settlement may be as small as a single house in remote area or as a large as a mega city. A settlement may be permanently or temporary. An example of a temporary settlement would be a refugee camp.
However a temporary settlement may become permanent over time. This happen to many refugees camps that have been built in conflict zones. Actual piece of land upon which a settlement is built is known as the settlement site.
Settlements usually develop in a particular pattern ( but not always).
A nucleated settlement is where the buildings are closed around a central point such as market square. Linear settlement is where the buildings are arranged in a line usually along the river or road and A dispersed settlement is where the buildings are spread out or scattered. Dispersed settlement are often found in remote, sparsely populated areas.