The key functions of an IT help desk include providing technical support to users, troubleshooting issues, and resolving IT-related problems. They serve as a primary point of contact for employees experiencing technical difficulties, ranging from password resets to software malfunctions. Help desks often manage tickets to track requests and ensure timely resolutions. Additionally, they are responsible for documenting issues and solutions, educating users about IT policies, and sometimes assisting with software installation and network-related inquiries.