This document discusses the importance of accessibility in online environments. It defines accessibility as equal opportunity and access to information and communication technologies for all students, including those with disabilities. The benefits of online accessibility are outlined, such as removing barriers that people may face in the real world. Assistive technologies can help students with disabilities access and interact with online content. However, poorly designed web content can still create barriers. The document provides examples of the costs of making alternative formats, such as transcribing audio content for a deaf student. It stresses the importance of timely delivery of accessible formats to avoid further disadvantaging students. Guidelines and resources are provided to help implement inclusive online practices.