A park ranger is a professional responsible for protecting and managing national parks, forests, and other natural areas. Their duties include monitoring wildlife, maintaining trails, and ensuring the safety of visitors. Park rangers also educate the public about the environment and conservation efforts, helping people understand the importance of preserving natural resources. In addition to their conservation work, park rangers often enforce laws and regulations within the parks. They may conduct search and rescue operations, respond to emergencies, and provide assistance to visitors. Overall, park rangers play a crucial role in maintaining the health of ecosystems and promoting outdoor recreation in places like Yosemite National Park and Yellowstone National Park.