What is the significance of the alt attribute in the <img> tag?

The alt attribute in the tag is significant because it provides alternative text for the image. This text serves several important purposes: it describes the content or function of the image for users who are unable to see it, such as those using screen readers or having visual impairments. Furthermore, in cases where an image fails to load, the alt text allows users to understand what was intended to be displayed. This enhances accessibility and improves user experience on websites, ensuring that all users have access to the information conveyed by images.

Additionally, search engines use the alt attribute to better understand the context of images, which can contribute to search engine optimization (SEO) efforts. The inclusion of meaningful alt text can also help improve the overall semantic structure of the webpage. Thus, the correct answer highlights a crucial aspect of web development, which is the commitment to accessibility and user-friendly design.