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People with visual impairments to "hear" what is on the screen.

When creating text for an image like yours, follow these guidelines from Harvard University and Section508.gov :

Bots like Google to "read" the image and index it correctly in search results.

While the specific file name gsu1o7hxba_1.jpg doesn't point to a famous or single unique image in a public database, the most "helpful text" for any image is high-quality or a Caption . These features ensure the content is accessible and understandable for everyone. Best Practices for Writing Helpful Text