Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can use them. More specifically, Web accessibility means that people with disabilities can perceive, understand, navigate, and interact with the Web, and that they can contribute to the Web.
Web accessibility is important as the web and internet have become important parts of our lives and making sure the web is accessible allows people with disabilities to be able to have equal access to the important services/features the web provides, such as education, online shopping, recreation, health services and more. Making your website accessible can also help make it more effective in reaching a wider audience, as it is now easier to navigate for people experiencing a disability
The answer varies by industry. Many organizations are required by law to make their digital content accessible. For others, U.S. Courts are overwhelmingly ruling in favor of accessibility. So, while the rule of law can be confusing, there's no question an accessible site reduces legal risk and opens a business to a larger consumer base.