Assistive technology is an umbrella of devices, software and tools to that help any person with a disability to complete a task.
This could be:
On Windows you can just press the Windows + Enter button to open the Windows Narrator.
On Chrome you can download the ChromeVox extension
On the Mac you can use the Apple Accessibility VoiceOver tool
No matter the browser, operating system or device there is a screen reader out there for you to use or experiment with.
Many operating systems are investing heavily in voice control, as it is easier to interact with the device.
Magnification is a tool many use, especially people of older age.
Braille Display for writing texts easily for the visual impaired. It is also used to read text as well.
Sip and Puff/ Eye Tracking