What is the difference between "alt text" and "long description"?

The distinction between alt text and long descriptions is rooted in their respective purposes and the level of detail they provide. Alt text, or alternative text, is intended to provide a concise summary of an image. It is typically brief, allowing screen readers to convey essential information about the image quickly to users who cannot see it. This succinctness is crucial for users with visual disabilities, as it helps them understand the context of images without overwhelming them with excessive detail.

On the other hand, long descriptions serve a different function. They offer a more thorough explanation of an image and are useful for conveying complex visual content that cannot be adequately described in a few words. Long descriptions may include more context, interpretation, or information about the image that is beneficial for users requiring additional detail to fully grasp what is depicted.

This detailed differentiation highlights the importance of using both alt text and long descriptions appropriately to ensure that all users, regardless of ability, can access and understand visual content effectively.