Making a GUI (Graphical User Interface) accessible means designing and developing it to be usable by people with a wide range of abilities, including those with disabilities. An accessible GUI provides equal access to information and functionality for all users, regardless of their physical or cognitive abilities.

Accessibility features in a GUI may include:

1. Keyboard navigation: Allowing users to interact with the GUI using only their keyboard.

2. Screen reader compatibility: Ensuring the GUI works with screen readers for visually impaired users.

3. High contrast mode: Providing a high contrast visual theme for users with visual impairments.

4. Font size adjustment: Allowing users to adjust font sizes for better readability.

5. Closed captions: Providing text descriptions of audio and video content.

6. Clear and simple language: Using clear and simple language in labels, buttons, and instructions.

7. Consistent navigation: Using consistent navigation and layout throughout the GUI.

8. Error prevention and recovery: Helping users avoid and recover from errors.

9. Colorblind mode: Providing a colorblind-friendly visual theme for users with color vision deficiency.

10. Compatibility with assistive technologies: Ensuring the GUI works with assistive technologies like speech-to-text software.

By incorporating these accessibility features, developers can create a GUI that is usable by a broader audience, including people with disabilities, and provide a more inclusive user experience.