The alt attribute provides alternative text for users who cannot see the image. This includes people using screen readers, users with slow internet connections, or those who have images turned off in their browsers. Always include descriptive alt text for informative images and use empty alt attributes for decorative ones. By doing so, you ensure that everyone can understand the content and purpose of your images, regardless of how they access your site.

Good alt text is concise and describes the image's function or content. Avoid phrases like "image of..." and never leave alt attributes out. Instead, focus on what the image conveys or the task it helps the user accomplish. This makes your site more accessible and helps users who rely on alternative text to fully understand your content.