This document discusses web accessibility and usability. It defines accessibility as a person with a disability's ability to access content, and usability as how easily someone can navigate a course without confusion. Accessibility and usability are important for legal and ethical reasons as well as for learning and motivation. The document provides tips for making content accessible, such as using proper text formatting with strong color contrast, heading tags, and labeled hyperlinks. It also discusses making images, videos, flash content, and documents accessible through techniques like alt tags, transcripts, and ensuring text can be copied from PDFs.