What is the difference between a Zoo and wild life sanctuary?

Explanation

Zoo:
1. A Zoo is a place where animals are held in capitivity and Public is allowed to visit and see the animals. It is a artificially created habitat.
2. A Zoo can sell, buy, breed or trade animals.
Wild life sanctuary:
1. A wild life sanctuary is a large area with natural surrounding where the animals are allowed to roam freely.
2. A boundary wall/barrier is in place to ensure that humans cannot enter the area, The animal gets the feel of a natural surrounding. 3. In many cases sanctuaries focus on maintaining and increasing the population of a particular species. Eg: Kaziranga sanctuary in Assam focuses on Rhinoceros population.