People with disabilities depend on the web way more than we do. There are devices to convert web content to formats that disabled people can read. For example, there are braille converters for blind people. However, images cannot be converted into such formats. Hence, developers are asked to make their sites accessible to people with disabilities by providing alternate textual descriptions of all images and video content that they use on their page. People with disabilities may not be able to view the images, but they can at least know what the images are.
Alex Calvert WMU School of Communication, Kalamazoo Michigan
June 21, 2016