Explanation:
National parks and sanctuaries are established for the purpose of conservation. The conservation of wildlife and their habitats is the primary objective of national parks and sanctuaries. These protected areas are meant to preserve the natural heritage of a country for the benefit of present and future generations.

Conservation:
Conservation of wildlife is necessary to maintain the ecological balance of nature. National parks and sanctuaries provide a safe habitat for animals and plants. They help in protecting endangered species from extinction. The conservation of wildlife also helps in maintaining the food chain and the ecosystem.

Recreation:
National parks and sanctuaries also provide opportunities for recreation. They offer a peaceful and natural environment for people to relax and enjoy the beauty of nature. People can engage in activities like hiking, camping, bird watching, and wildlife photography in these protected areas.

Hunting:
Hunting is not allowed in national parks and sanctuaries. These protected areas are meant for the conservation of wildlife, and hunting would be detrimental to this objective.

Pets:
Pets are not allowed in national parks and sanctuaries as they can disturb the wildlife and their habitats. Pets can also introduce diseases to the wildlife, which can be harmful to their survival.

In conclusion, national parks and sanctuaries are established primarily for the purpose of conservation. They provide a safe habitat for wildlife and help in maintaining the ecological balance of nature. These protected areas also offer opportunities for recreation and promote awareness about the importance of wildlife conservation.