Desktop applications can have a wide range of features and functionalities depending on their purpose and target audience. Some common features that can be included in a desktop application are user authentication and access control, file management and storage, data encryption and security, intuitive user interfaces, integration with external hardware devices, database management, offline capability, and automatic updates. Additionally, desktop applications can leverage advanced functionalities such as multi-threading for efficient performance, integration with cloud services, real-time collaboration, and reporting and analytics capabilities.