Which device helps improve the interaction of individuals with disabilities when accessing computers?

The voice synthesizer is a device that significantly enhances the ability of individuals with disabilities to interact with computers. This technology converts text into speech, allowing users with visual impairments or reading difficulties to access written content audibly. By providing auditory feedback, it helps users to navigate software and access information more effectively, thus facilitating better communication and engagement with computer systems.

The other devices mentioned, while useful in their own right, do not specifically address the interaction needs of individuals with disabilities in the same way. A keyboard is a standard input device, but it doesn't cater specifically to accessibility needs. An external hard drive is used for additional storage and backup but does not enhance interaction. Similarly, a graphics card is essential for rendering images and video but does not play a role in improving accessibility for users with disabilities.