What is the dissimilarity between zoo and wildlife sanctuary?

A Wildlife Sanctuary is a protected forest where wild animals live without danger of human hunting/poaching. The whole area is protected by rangers and the animals that live in the sanctuary are constantly monitored.

A Wildlife Safari is like a tour where one or more wildlife rangers and tourist guides take us for a trip through the jungle either in the day or night. This is different than seeing animals in the zoo because you see them in their natural habitat.