The image is a UML (Unified Modeling Language) class diagram representing the structure of a health application system. There are four main classes depicted: 'Registration,' 'User,' 'Admin,' and 'UserInteraction,' each with attributes and methods. The 'Registration' class includes attributes such as name, email, and password, and provides methods to registerUser() and login(). The 'User' class contains attributes similar to the 'Registration' class with the addition of an address and includes methods to register(), login(), and logout(). The 'Admin' class has an adminName attribute and a viewUser() method, suggesting the ability to manage user accounts. The 'UserInteraction' class is linked to the 'User' class, indicating a one-to-one relationship, and includes an attribute for selectedDisease and methods to chooseDisease() and uploadImage(). Lastly, a 'Report' class is associated with the 'User' class, with a method to showReport(). The diagram's associations indicate that an admin can manage multiple users, and each user can have a registration and interact with the system to select diseases and upload images, which can then generate a report.