What is the difference between a nature reserve and a national park?

Currently, humanity has created such unique creations as nature reserves and national parks. All of them are pleasing to the eye, but they also have some peculiarities.

The purpose of creating reserves is to maintain biological diversity and natural development of natural complexes, lands, water bodies. Visiting such areas without permission is prohibited.

National parks are usually accessible for the eyes of tourists, walking. The activities of people using natural objects are prohibited on this territory.