The 1990 Americans with Disabilities Act (ADA) is a U.S. non-discrimination law that guarantees that all People with disabilities such as walking, seeing, hearing, talking, or any type of disability can access products, facilities such as transportation, education, job opportunities, public housing, communications, and government activities. The civil rights law prohibits discrimination against disabled persons and guarantees that these persons have the same rights and opportunities as everyone else.
If you're curious whether websites fall under the ADA, the U.S. Justice Department enforces ADA laws governing state and local government facilities (Title II) and consistently interpreted (Title III) to include websites as places of public accommodation while (Title I) often allows businesses of 15 or more workers to comply. Therefore, the ADA, in conjunction with Section 508, serves as the US accessibility laws.
infographic by: www.whoisaccessible.com