Accessibility is the ability of the disabled to utilize your products, services, tools and content.
Accessible content must be:
Perceivable: Users must be able to perceive the information being presented. It must be visible to at least one of their senses.
Operable: Users must be able to operate the interface and its components. The interface cannot require interaction that the user cannot perform.
Understandable: Users must be able to understand the information as well as the interface.
Robust: Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.
A key part of accessibility is providing a comparable learning experience for a disabled user. A comparable experience means that the product, service, tool or content meets the following:
Timely access: The information and data is available to individuals with disabilities at the same time as individuals without disabilities. (This does not preclude captions that are slightly delayed or other reasonable differences).
Accurate: The information and data reflects the intended meaning especially when converted into another form or media.
Complete: All crucial information and data is included when accessed by assistive technology or converted into another form or media.
Efficient: An individual with a disability exerts a reasonably similar or comparable amount of effort in using electronic and information technology as compared to an individual without a disability.