What is difference between a National Park and Wild Life Sanctuary?

National Park

A protected area where wildlife, ecosystem and landscape are conserved with highest protection. No human activity like grazing, firewood collection or commercial use is allowed.

Examples: Jim Corbett National Park, Kaziranga National Park.

Wildlife Sanctuary

A protected area where animals are given safe habitat but some regulated human activity (like grazing or firewood collection) may be allowed depending on state rules.

Examples: Sultanpur Bird Sanctuary in Haryana, Bharatpur Sanctuary.

Main Difference is National Parks have stricter protection, no human interference and are notified by central government; Sanctuaries allow limited human use and are more flexible.